In this week’s episode of On the Evidence, Mathematica’s Beth Weigensberg talks about an article she co-authored describing findings from a 2013 needs assessment on the challenges state agencies faced in using their data to inform their programs.

A sound, effective strategy involves these four steps.

A whopping 3.2 billion people, or 42% of the world's population, uses social media. On average, people spend over two hours of their day messaging and surfing social media networks.

After having a positive experience with a brand on social media, 71% of people will often recommend the brand to their friends and family. On top of that, 49% of people are taking their cues on what to buy from social media influencers.

Based on these statistics, it's crucial for businesses to have a solid social media marketing strategy in place. Unfortunately, many business owners have no idea how to handle social media marketing.

complete article

An alternative college admissions test, used by some Christian schools, draws a record 50,000 students.

The Classic Learning Test (CLT), a niche college entrance exam aspiring to bring a sense of virtue to standardized tests, saw a 1,000 percent increase in registrations over its short history when the SAT and ACT canceled testing for the remainder of the school year due to COVID-19.

“Because we are able to administer the test remotely, we’re kind of the only game in town,” said Jeremy Tate, who created the CLT four years ago amid a renaissance in Classical education, including among Christians.

At its first administration in June 2016, 47 students took the CLT. With the bump in registration, 50,000 students will take its suite of tests—the CLT, and the CLT-8 and CLT-10, designed for lower grades—during the 2019-2020 academic year. That’s more than double last year’s total.

Though not a Christian company, CLT references figures including John Henry Newman and C. S. Lewis in its promotional materials and stresses the moral, formational dimension to education. The exam has been popular among classical Christian schools, which educate over 40,000 students in the US, and homeschoolers, who make up about 40 percent of CLT test-takers.

So far, 178 colleges and universities in the US accept the exam, mostly Catholic and Protestant schools. For other institutions, the CLT can serve as a supplemental assessment.

The College Board and ACT Inc., the companies that administer the SAT and ACT, respectively, have canceled or postponed in-person testing until the fall, leading many colleges to make the admissions exams an optional part of their applications. In 2018, around 2 million students took the SAT and 1.9 million took the ACT.

While some registrants may turn to the CLT this year for the convenience ...

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Browsery TX807.R7845 2018

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Since May 4, the social distancing norms seem to have gone for a toss

JNU extends registration deadline for entrance examinations to May 15 due t...

Dewey Library - PS153.M56 R66 2018

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In marketing, transparency and vulnerability are unjustly stigmatized. The words conjure illusions of being frightened, imperfect, and powerless. And for companies that shove carefully curated personas in front of users, little is more terrifying than losing control of how people perceive the brand.

Let’s shatter this illusioned stigma. Authentic vulnerability and transparency are strengths masquerading as weaknesses. And companies too scared to embrace both traits in their content forfeit bona fide user-brand connections for often shallow, misleading engagement tactics that create fleeting relationships.

Transparency and vulnerability are closely entwined concepts, but each one engages users in a unique way. Transparency is how much information you share, while vulnerability is the truth and meaning behind your actions and words. Combining these ideas is the trick to creating empowering and meaningful content. You can’t tell true stories of vulnerability without transparency, and to be authentically transparent you must be vulnerable.

To be vulnerable, your brand and its content must be brave, genuine, humble, and open, all of which are traits that promote long-term customer loyalty. And if you’re transparent with users about who you are and about your business practices, you’re courting 94 percent of consumers who say they’re more loyal to brands that offer complete openness and 89 percent of people who say they give transparent companies a second chance after a bad experience.

For many companies, being completely honest and open with their customers—or employees, in some cases—only happens in a crisis. Unfortunately for those businesses, using vulnerability and transparency only as a crisis management strategy diminishes how sincere they appear and can reduce customer satisfaction.

Unlocking the potential of being transparent and vulnerable with users isn’t a one-off tactic or quick-fix emergency response tool—it’s a commitment to intimate storytelling that embraces a user’s emotional and psychological needs, which builds a meaningful connection between the storyteller and the audience.

The three storytelling pillars of vulnerable and transparent content

In her book, Braving the Wilderness, sociologist Brené Brown explains that vulnerability connects us at an emotional level. She says that when we recognize someone is being vulnerable, we invest in their story and begin to develop an emotional bond. This interwoven connection encourages us to experience the storyteller’s joy and pain, and then creates a sense of community and common purpose among the person being vulnerable and the people who acknowledge that vulnerability.

Three pillars in a company’s lifecycle embrace this bond and provide an outline for telling stories worthy of a user’s emotional investment. The pillars are:

• the origins of a company, product, idea, or situation;
• intimate narratives about customers’ life experiences;
• and insights about product success and failure.

Origin stories

An origin story spins a transparent tale about how a company, product, service, or idea is created. It is often told by a founder, CEO, or industry innovator. This pillar is usually used as an authentic way to provide crisis management or as a method to change how users feel about a topic, product, or your brand.

Customers’ life experiences

While vulnerable origin stories do an excellent job of making users trust your brand, telling a customer’s personal life story is arguably the most effective way to use vulnerability to entwine a brand with someone’s personal identity.

Unlike an origin story, the customer experiences pillar is focused on being transparent about who your customers are, what they’ve experienced, and how those journeys align with values that matter to your brand. Through this lens, you’ll empower your customers to tell emotional, meaningful stories that make users feel vulnerable in a positive way. In this situation, your brand is often a storytelling platform where users share their story with the brand and fellow customers.

Product and service insights

Origin stories make your brand trustworthy in a crisis, and customers’ personal stories help users feel an intimate connection with your brand’s persona and mission. The last pillar, product and service insights, combines the psychological principles that make origin and customer stories successful. The outcome is a vulnerable narrative that rallies users’ excitement about, and emotional investment in, what a company sells or the goals it hopes to achieve.

Vulnerability, transparency, and the customer journey

The three storytelling pillars are crucial to embracing transparency and vulnerability in your content strategy because they let you target users at specific points in their journey. By embedding the pillars in each stage of the customer’s journey, you teach users about who you are, what matters to you, and why they should care.

For our purposes, let’s define the user journey as:

• awareness;
• interest;
• consideration;
• conversion;
• and retention.

Awareness

People give each other seven seconds to make a good first impression. We’re not so generous with brands and websites. After discovering your content, users determine if it’s trustworthy within one-tenth of a second.

Page design and aesthetics are often the determining factors in these split-second choices, but the information users discover after that decision shapes their long-term opinions about your brand. This snap judgement is why transparency and vulnerability are crucial within awareness content.

When you only get one chance to make a positive first impression with your audience, what content is going to be more memorable?

Typical marketing “fluff” about how your brand was built on a shared vision and commitment to unyielding customer satisfaction and quality products? Or an upfront, authentic, and honest story about the trials and tribulations you went through to get where you are now?

Buffer, a social media management company that helped pioneer the radical transparency movement, chose the latter option. The outcome created awareness content that leaves a positive lasting impression of the brand.

In 2016, Joel Gascoigne, cofounder and CEO of Buffer, used an origin story to discuss the mistakes he and his company made that resulted in laying off 10 employees.

In the blog post “Tough News: We’ve Made 10 Layoffs. How We Got Here, the Financial Details and How We’re Moving Forward,” Gascoigne wrote about Buffer’s over-aggressive growth choices, lack of accountability, misplaced trust in its financial model, explicit risk appetite, and overenthusiastic hiring. He also discussed what he learned from the experience, the changes Buffer made based on these lessons, the consequences of those changes, and next steps for the brand.

Gascoigne writes about each subject with radical honesty and authenticity. Throughout the article, he’s personable and relatable; his tone and voice make it obvious he’s more concerned about the lives he’s irrevocably affected than the public image of his company floundering. Because Gascoigne is so transparent and vulnerable in the blog post, it’s easy to become invested in the narrative he’s telling. The result is an article that feels more like a deep, meaningful conversation over coffee instead of a carefully curated, PR-approved response.

Yes, Buffer used this origin story to confront a PR crisis, but they did so in a way that encouraged users to trust the brand. Buffer chose to show up and be seen when they had no control over the outcome. And because Gascoigne used vulnerability and transparency to share the company’s collective pain, the company reaped positive press coverage and support on social media—further improving brand awareness, user engagement, and customer loyalty.

However, awareness content isn’t always brand focused. Sometimes, smart awareness content uses storytelling to teach users and shape their worldviews. The 2019 State of Science Index is an excellent example.

The annual State of Science Index evaluates how the global public perceives science. The 2019 report shows that 87 percent of people acknowledge that science is necessary to solve the world’s problems, but 33 percent are skeptical of science and believe that scientists cause as many problems as they solve. Furthermore, 57 percent of respondents are skeptical of science because of scientists’ conflicting opinions about topics they don’t understand.

3M, the multinational science conglomerate that publishes the report, says the solution for this anti-science mindset is to promote intimate storytelling among scientists and layfolk.

3M creates an origin story with its awareness content by focusing on the ins and outs of scientific research. The company is open and straightforward with its data and intentions, eliminating any second guesses users might have about the content they’re digesting.

The company kicked off this strategy on three fronts, and each storytelling medium interweaves the benefits of vulnerability and transparency by encouraging researchers to tell stories that lead with how their findings benefit humanity. Every story 3M tells focuses on breaking through barriers the average person faces when they encounter science and encouraging scientists to be vulnerable and authentic with how they share their research.

First, 3M began a podcast series known as Science Champions. In the podcast, 3M Chief Science Advocate Jayshree Seth interviews scientists and educators about the global perception of science and how science and scientists affect our lives. The show is currently in its second season and discusses a range of topics in science, technology, engineering, and math.

Second, the company worked with science educators, journalist Katie Couric, actor Alan Alda, and former NASA astronaut Scott Kelly to develop the free Scientists as Storytellers Guide. The ebook helps STEM researchers improve how and why they communicate their work with other people—with a special emphasis on being empathetic with non-scientists. The guide breaks down how to develop communications skills, overcome common storytelling challenges, and learn to make science more accessible, understandable, and engaging for others.

Last, 3M created a film series called Beyond the Beaker that explores the day-to-day lives of 3M scientists. In the short videos, scientists give the viewer a glimpse into their hobbies and home life. The series showcases how scientists have diverse backgrounds, hobbies, goals, and dreams.

Unlike Buffer, which benefits directly from its awareness content, 3M’s three content mediums are designed to create a long-term strategy that changes how people understand and perceive science, by spreading awareness through third parties. It’s too early to conclude that the strategy will be successful, but it’s off to a good start. Science Champions often tops “best of” podcast lists for science lovers, and the Scientists as Storytellers Guide is a popular resource among public universities.

Interest

How do you court new users when word-of-mouth and organic search dominate how people discover new brands? Target their interests.

Now, you can be like the hundreds of other brands that create a “10 best things” list and hope people stumble onto your content organically and like what they see. Or, you can use content to engage with people who are passionate about your industry and have genuine, open discussions about the topics that matter to you both.

The latter option is a perfect fit for the product and service insights pillar, and the customers’ life experiences pillar.

To succeed in these pillars you must balance discussing the users’ passions and how your brand plays into that topic against appearing disingenuous or becoming too self-promotional.

Nonprofits have an easier time walking this taut line because people are less judgemental when engaging with NGOs, but it’s rare for a for-profit company to achieve this balance. SpaceX and Thinx are among the few brands that are able to walk this tightrope.

Thinx, a women’s clothing brand that sells period-proof underwear, uses its blog to generate awareness, interest, and consideration content via the customers’ life experiences pillar. The blog, aptly named Periodical, relies on transparency and vulnerability as a cornerstone to engage users about reproductive and mental health.

Toni Brannagan, Thinx’s content editor, says the brand embraces transparency and vulnerability by sharing diverse ideas and personal experiences from customers and experts alike, not shying away from sensitive subjects and never misleading users about Thinx or the subjects Periodical discusses.

As a company focused on women’s healthcare, the product Thinx sells is political by nature and entangles the brand with themes of shame, cultural differences, and personal empowerment. Thinx’s strategy is to tackle these subjects head-on by having vulnerable conversations in its branding, social media ads, and Periodical content.

“Vulnerability and transparency play a role because you can’t share authentic diverse ideas and experiences about those things—shame, cultural differences, and empowerment—without it,” Brannagan says.

A significant portion of Thinx’s website traffic is organic, which means Periodical’s interest-driven content may be a user’s first touchpoint with the brand.

“We’ve seen that our most successful organic content is educational, well-researched articles, and also product-focused blogs that answer the questions about our underwear, in a way that’s a little more casual than what’s on our product pages,” Brannagan says. “In contrast, our personal essays and ‘more opinionated’ content performs better on social media and email.”

Thanks in part to the blog’s authenticity and open discussions about hard-hitting topics, readers who find the brand through organic search drive the most direct conversions.

Conversations with users interested in the industry or topic your company is involved in don’t always have to come from the company itself. Sometimes a single person can drive authentic, open conversations and create endearing user loyalty and engagement.

For a company that relies on venture capital investments, NASA funding, and public opinion for its financial future, crossing the line between being too self-promotional and isolating users could spell doom. But SpaceX has never shied away from difficult or vulnerable conversations. Instead, the company’s founder, Elon Musk, embraces engaging with users interests in public forums like Twitter and press conferences.

Musk’s tweets about SpaceX are unwaveringly authentic and transparent. He often tweets about his thoughts, concerns, and the challenges his companies face. Plus, Musk frequently engages with his Twitter followers and provides candid answers to questions many CEOs avoid discussing. This authenticity has earned him a cult-like following.

Musk and SpaceX create conversations that target people’s interests and use vulnerability to equally embrace failure and success. Both the company and its founder give the public and investors an unflinching story of space exploration.

And despite laying off 10 percent of its workforce in January of 2019, SpaceX is flourishing. In May 2019, its valuation had risen to $33.3 billion and reported annual revenue exceeded $2 billion. It also earned global media coverage from launching Musk’s Tesla Roadster into space, recently completed a test flight of its Crew Dragon space vehicle, and cemented multiple new payload contracts.

By engaging with users on social media and through standard storytelling mediums, Thinx and SpaceX bolster customer loyalty and brand engagement.

Consideration

Modern consumers argue that ignorance is not bliss. When users are considering converting with a brand, 86 percent of consumers say transparency is a deciding factor. Transparency remains crucial even after they convert, with 85 percent of users saying they’ll support a transparent brand during a PR crisis.

Your brand must be open, clear, and honest with users; there is no longer another viable option.

So how do you remain transparent while trying to sell someone a product? One solution employed by REI and Everlane is to be openly accountable to your brand and your users via the origin stories and product insights pillars.

REI, a national outdoor equipment retailer, created a stewardship program that behaves as a multifaceted origin story. The program’s content highlights the company’s history and manufacturing policies, and it lets users dive into the nitty-gritty details about its factories, partnerships, product production methods, manufacturing ethics, and carbon footprint.

REI also employs a classic content hub strategy to let customers find the program and explore its relevant information. From a single landing page, users can easily find the program through the website’s global navigation and then navigate to every tangential topic the program encompasses.

REI also publishes an annual stewardship report, where users can learn intimate details about how the company makes and spends its money.

Everlane, a clothing company, is equally transparent about its supply chain. The company promotes an insider’s look into its global factories via product insights stories. These glimpses tell the personal narratives of factory employees and owners, and provide insights into the products manufactured and the materials used. Everlane also published details of how they comply with the California Transparency in Supply Chains Act to guarantee ethical working conditions throughout its supply chain, including refusing to partner with human traffickers.

The crucial quality that Everlane and REI share is they publicize their transparency and encourage users to explore the shared information. On each website, users can easily find information about the company’s transparency endeavors via the global navigation, social media campaigns, and product pages.

The consumer response to transparent brands like REI and Everlane is overwhelmingly positive. Customers are willing to pay price premiums for the additional transparency, which gives them comfort by knowing they’re purchasing ethical products.

REI’s ownership model has further propelled the success of its transparency by using it to create unwavering customer engagement and loyalty. As a co-op where customers can “own” part of the company for a one-time $20 membership fee, REI is beholden to its members, many of which pay close attention to its supply chain and the brands REI partners with.

After a deadly school shooting in Parkland, Florida, REI members urged the company to refuse to carry CamelBak products because the brand’s parent company manufactures assault-style weapons. Members argued the partnership violated REI’s supply chain ethics. REI listened and halted orders with CamelBak. Members rejoiced and REI earned a significant amount of positive press coverage.

Conversion

Imagine you’ve started incorporating transparency throughout your company, and promote the results to users. Your brand also begins engaging users by telling vulnerable, meaningful stories via the three pillars. You’re seeing great engagement metrics and customer feedback from these efforts, but not much else. So, how do you get your newly invested users to convert?

Provide users with a full-circle experience.

If you combine the three storytelling pillars with blatant transparency and actively promote your efforts, users often transition from the consideration stage into the conversion state. Best of all, when users convert with a company that already earned their trust on an emotional level, they’re more likely to remain loyal to the brand and emotionally invested in its future.

The crucial step in combining the three pillars is consistency. Your brand’s stories must always be authentic and your content must always be transparent. The outdoor clothing brand Patagonia is among the most popular and successful companies to maintain this consistency and excel with this strategy.

Patagonia is arguably the most vocal and aggressive clothing retailer when it comes to environmental stewardship and ethical manufacturing.

In some cases, the company tells users not to buy its clothing because rampant consumerism harms the environment too much, which they care about more than profits. This level of radical transparency and vulnerability skyrocketed the company’s popularity among environmentally-conscious consumers.

In 2011, Patagonia took out a full-page Black Friday ad in the New York Times with the headline “Don’t Buy This Jacket.” In the ad, Patagonia talks about the environmental toll manufacturing clothes requires.

“Consider the R2 Jacket shown, one of our best sellers. To make it required 135 liters of water, enough to meet the daily needs (three glasses a day) of 45 people. Its journey from its origin as 60 percent recycled polyester to our Reno warehouse generated nearly 20 pounds of carbon dioxide, 24 times the weight of the finished product. This jacket left behind, on its way to Reno, two-thirds [of] its weight in waste.”

The ad encourages users to not buy any new Patagonia clothing if their old, ratty clothes can be repaired. To help, Patagonia launched a supplementary subdomain to its e-commerce website to support its Common Thread Initiative, which eventually got rebranded as the Worn Wear program.

Patatgonia’s Worn Wear subdomain gets users to engage with the company about causes each party cares about. Through Worn Wear, Patagonia will repair your old gear for free. If you’d rather have new gear, you can instead sell the worn out clothing to Patagonia, and they’ll repair it and then resell the product at a discount. This interaction encourages loyalty and repeat brand-user engagement.

In addition, the navigation on Patagonia’s main website practically begs users to learn about the brand’s non-profit initiatives and its commitment to ethical manufacturing.

Today, Patagonia is among the most respected, profitable, and trusted consumer brands in the United States.

Retention

Content strategy expands through nearly every aspect of the marketing stack, including ad campaigns, which take a more controlled approach to vulnerability and transparency. To target users in the retention stage and keep them invested in your brand, your goal is to create content using the customers’ life experiences pillar to amplify the emotional bond and brand loyalty that vulnerability creates.

Always took this approach and ended up with one of its most successful social media campaigns.

In June 2014, Always launched its #LikeAGirl campaign to empower adolescent and teenage girls by transforming the phrase “like a girl” from a slur into a meaningful and positive statement.

The campaign is centered on a video in which Always tasked children, teenagers, and adults to behave “like a girl” by running, punching, and throwing while mimicking their perception of how a girl performs the activity. Young girls performed the tasks wholeheartedly and with gusto, while boys and adults performed overly feminine and vain characterizations. The director then challenged the person on their portrayal, breaking down what doing things “like a girl” truly means. The video ends with a powerful, heart-swelling statement:

This customer story campaign put the vulnerability girls feel during puberty front and center so the topic would resonate with users and give the brand a powerful, relevant, and purposeful role in this connection, according to an Institute for Public Relations campaign analysis.

Consequently, the #LikeAGirl campaign was a rousing success and blew past the KPIs Always established. Initially, Always determined an “impactful launch” for the video meant 2 million video views and 250 million media impressions, the analysis states.

Five years later, the campaign video has more than 66.9 million views and 42,700 comments on YouTube, with more than 85 percent of users reacting positively. Here are a few additional highlights the analysis document points out:

• Eighty-one percent of women ages 16–24 support Always in creating a movement to reclaim “like a girl” as a positive and inspiring statement.
• More than 1 million people shared the video.
• Thirteen percent of users created user-generated content about the campaign.
• The #LikeAGirl program achieved 4.5 billion global impressions.
• The campaign received 290 million social impressions, with 133,000 social mentions, and it caused a 195.3 percent increase in the brand’s Twitter followers.

Among the reasons the #LikeAGirl content was so successful is that it aligned with Brené Brown’s concept that experiencing vulnerability creates a connection centered on powerful, shared emotions. Always then amplified the campaign’s effectiveness by using those emotions to encourage specific user behavior on social media.

How do you know if you’re making vulnerable content?

Designing a vulnerability-focused content strategy campaign begins by determining what kind of story you want to tell, why you want to tell it, why that story matters, and how that story helps you or your users achieve a goal.

When you’re brainstorming topics, the most important factor is that you need to care about the stories you’re telling. These tales need to be meaningful because if you’re weaving a narrative that isn’t important to you, it shows. And ultimately, why do you expect your users to care about a subject if you don’t?

Let’s say you’re developing a content campaign for a nonprofit, and you want to use your brand’s emotional identity to connect with users. You have a handful of possible narratives but you’re not sure which one will best unlock the benefits of vulnerability. In a Medium post about telling vulnerable stories, Cayla Vidmar presents a list of seven self-reflective questions that can reveal what narrative to choose and why.

If you can answer each of Vidmar’s questions, you’re on your way to creating a great story that can connect with users on a level unrivaled by other methods. Here’s what you should ask yourself:

• What meaning is there in my story?
• Can my story help others?
• How can it help others?
• Am I willing to struggle and be vulnerable in that struggle (even with strangers)?
• How has my story shaped my worldview (what has it made me believe)?
• What good have I learned from my story?
• If other people discovered this good from their story, would it change their lives?

While you’re creating narratives within the three pillars, refer back to Vidmar’s list to maintain the proper balance between vulnerability and transparency.

What’s next?

You now know that vulnerability and transparency are an endless fountain of strength, not a weakness. Vulnerable content won’t make you or your brand look weak. Your customers won’t flee at the sight of imperfection. Being human and treating your users like humans isn’t a liability.

It’s time for your brand to embrace its untapped potential. Choose to be vulnerable, have the courage to tell meaningful stories about what matters most to your company and your customers, and overcome the fear of controlling how users will react to your content.

Origin story

Every origin story has six chapters:

• the discovery of a problem or opportunity;
• what caused this problem or opportunity;
• the consequences of this discovery;
• the solution to these consequences;
• lessons learned during the process;
• and next steps.

Customers’ life experiences

Every customer journey narrative has six chapters:

• plot background to frame the customer’s experiences;
• the customer’s journey;
• how the brand plays into that journey (if applicable);
• how the customer’s experiences changed them;
• what the customer learned from this journey;
• and how other people can use this information to improve their lives.

Product and service insights

Narratives about product and service insights have seven chapters:

• an overview of the product/service;
• how that product/service affects users;
• why the product/service is important to the brand’s mission or to users;
• what about this product/service failed or succeeded;
• why did that success or failure happen;
• what lessons did this scenario create;
• and how are the brand and its users moving forward.

You have the tools and knowledge necessary to be transparent, create vulnerable content, and succeed. And we need to tell vulnerable stories because sharing our experiences and embracing our common connections matters. So go ahead, put yourself out into the open, and see how your customers respond.

Once upon a time, we relied on browsers to handle caching for us; as developers in those days, we had very little control. But then came Progressive Web Apps (PWAs), Service Workers, and the Cache API—and suddenly we have expansive power over what gets put in the cache and how it gets put there. We can now cache everything we want to… and therein lies a potential problem.

Media files—especially images—make up the bulk of average page weight these days, and it’s getting worse. In order to improve performance, it’s tempting to cache as much of this content as possible, but should we? In most cases, no. Even with all this newfangled technology at our fingertips, great performance still hinges on a simple rule: request only what you need and make each request as small as possible.

To provide the best possible experience for our users without abusing their network connection or their hard drive, it’s time to put a spin on some classic best practices, experiment with media caching strategies, and play around with a few Cache API tricks that Service Workers have hidden up their sleeves.

Best intentions

All those lessons we learned optimizing web pages for dial-up became super-useful again when mobile took off, and they continue to be applicable in the work we do for a global audience today. Unreliable or high latency network connections are still the norm in many parts of the world, reminding us that it’s never safe to assume a technical baseline lifts evenly or in sync with its corresponding cutting edge. And that’s the thing about performance best practices: history has borne out that approaches that are good for performance now will continue being good for performance in the future.

Before the advent of Service Workers, we could provide some instructions to browsers with respect to how long they should cache a particular resource, but that was about it. Documents and assets downloaded to a user’s machine would be dropped into a directory on their hard drive. When the browser assembled a request for a particular document or asset, it would peek in the cache first to see if it already had what it needed to possibly avoid hitting the network.

We have considerably more control over network requests and the cache these days, but that doesn’t excuse us from being thoughtful about the resources on our web pages.

Request only what you need

As I mentioned, the web today is lousy with media. Images and videos have become a dominant means of communication. They may convert well when it comes to sales and marketing, but they are hardly performant when it comes to download and rendering speed. With this in mind, each and every image (and video, etc.) should have to fight for its place on the page. 

A few years back, a recipe of mine was included in a newspaper story on cooking with spirits (alcohol, not ghosts). I don’t subscribe to the print version of that paper, so when the article came out I went to the site to take a look at how it turned out. During a recent redesign, the site had decided to load all articles into a nearly full-screen modal viewbox layered on top of their homepage. This meant requesting the article required requests for all of the assets associated with the article page plus all the contents and assets for the homepage. Oh, and the homepage had video ads—plural. And, yes, they auto-played.

I popped open DevTools and discovered the page had blown past 15 MB in page weight. Tim Kadlec had recently launched What Does My Site Cost?, so I decided to check out the damage. Turns out that the actual cost to view that page for the average US-based user was more than the cost of the print version of that day’s newspaper. That’s just messed up.

Sure, I could blame the folks who built the site for doing their readers such a disservice, but the reality is that none of us go to work with the goal of worsening our users’ experiences. This could happen to any of us. We could spend days scrutinizing the performance of a page only to have some committee decide to set that carefully crafted page atop a Times Square of auto-playing video ads. Imagine how much worse things would be if we were stacking two abysmally-performing pages on top of each other!

Media can be great for drawing attention when competition is high (e.g., on the homepage of a newspaper), but when you want readers to focus on a single task (e.g., reading the actual article), its value can drop from important to “nice to have.” Yes, studies have shown that images excel at drawing eyeballs, but once a visitor is on the article page, no one cares; we’re just making it take longer to download and more expensive to access. The situation only gets worse as we shove more media into the page. 

We must do everything in our power to reduce the weight of our pages, so avoid requests for things that don’t add value. For starters, if you’re writing an article about a data breach, resist the urge to include that ridiculous stock photo of some random dude in a hoodie typing on a computer in a very dark room.

Request the smallest file you can

Now that we’ve taken stock of what we do need to include, we must ask ourselves a critical question: How can we deliver it in the fastest way possible? This can be as simple as choosing the most appropriate image format for the content presented (and optimizing the heck out of it) or as complex as recreating assets entirely (for example, if switching from raster to vector imagery would be more efficient).

Offer alternate formats

When it comes to image formats, we don’t have to choose between performance and reach anymore. We can provide multiple options and let the browser decide which one to use, based on what it can handle.

You can accomplish this by offering multiple sources within a picture or video element. Start by creating multiple formats of the media asset. For example, with WebP and JPG, it’s likely that the WebP will have a smaller file size than the JPG (but check to make sure). With those alternate sources, you can drop them into a picture like this:

<picture>
  <source srcset="my.webp" type="image/webp">
  <img src="my.jpg" alt="Descriptive text about the picture.">
</picture>

Browsers that recognize the picture element will check the source element before making a decision about which image to request. If the browser supports the MIME type “image/webp,” it will kick off a request for the WebP format image. If not (or if the browser doesn’t recognize picture), it will request the JPG. 

The nice thing about this approach is that you’re serving the smallest image possible to the user without having to resort to any sort of JavaScript hackery.

You can take the same approach with video files:

<video controls>
  <source src="my.webm" type="video/webm">
  <source src="my.mp4" type="video/mp4">
  <p>Your browser doesn’t support native video playback,
    but you can <a href="my.mp4" download>download</a>
    this video instead.</p>
</video>

Browsers that support WebM will request the first source, whereas browsers that don’t—but do understand MP4 videos—will request the second one. Browsers that don’t support the video element will fall back to the paragraph about downloading the file.

The order of your source elements matters. Browsers will choose the first usable source, so if you specify an optimized alternative format after a more widely compatible one, the alternative format may never get picked up.  

Depending on your situation, you might consider bypassing this markup-based approach and handle things on the server instead. For example, if a JPG is being requested and the browser supports WebP (which is indicated in the Accept header), there’s nothing stopping you from replying with a WebP version of the resource. In fact, some CDN services—Cloudinary, for instance—come with this sort of functionality right out of the box.

Offer different sizes

Formats aside, you may want to deliver alternate image sizes optimized for the current size of the browser’s viewport. After all, there’s no point loading an image that’s 3–4 times larger than the screen rendering it; that’s just wasting bandwidth. This is where responsive images come in.

Here’s an example:

<img src="medium.jpg"
  srcset="small.jpg 256w,
    medium.jpg 512w,
    large.jpg 1024w"
  sizes="(min-width: 30em) 30em, 100vw"
  alt="Descriptive text about the picture.">

There’s a lot going on in this super-charged img element, so I’ll break it down:

• This img offers three size options for a given JPG: 256 px wide (small.jpg), 512 px wide (medium.jpg), and 1024 px wide (large.jpg). These are provided in the srcset attribute with corresponding width descriptors.
• The src defines a default image source, which acts as a fallback for browsers that don’t support srcset. Your choice for the default image will likely depend on the context and general usage patterns. Often I’d recommend the smallest image be the default, but if the majority of your traffic is on older desktop browsers, you might want to go with the medium-sized image.
• The sizes attribute is a presentational hint that informs the browser how the image will be rendered in different scenarios (its extrinsic size) once CSS has been applied. This particular example says that the image will be the full width of the viewport (100vw) until the viewport reaches 30 em in width (min-width: 30em), at which point the image will be 30 em wide. You can make the sizes value as complicated or as simple as you want; omitting it causes browsers to use the default value of 100vw.

You can even combine this approach with alternate formats and crops within a single picture. ????

All of this is to say that you have a number of tools at your disposal for delivering fast-loading media, so use them!

Defer requests (when possible)

Years ago, Internet Explorer 11 introduced a new attribute that enabled developers to de-prioritize specific img elements to speed up page rendering: lazyload. That attribute never went anywhere, standards-wise, but it was a solid attempt to defer image loading until images are in view (or close to it) without having to involve JavaScript.

There have been countless JavaScript-based implementations of lazy loading images since then, but recently Google also took a stab at a more declarative approach, using a different attribute: loading.

The loading attribute supports three values (“auto,” “lazy,” and “eager”) to define how a resource should be brought in. For our purposes, the “lazy” value is the most interesting because it defers loading the resource until it reaches a calculated distance from the viewport.

Adding that into the mix…

<img src="medium.jpg"
  srcset="small.jpg 256w,
    medium.jpg 512w,
    large.jpg 1024w"
  sizes="(min-width: 30em) 30em, 100vw"
  loading="lazy"
  alt="Descriptive text about the picture.">

This attribute offers a bit of a performance boost in Chromium-based browsers. Hopefully it will become a standard and get picked up by other browsers in the future, but in the meantime there’s no harm in including it because browsers that don’t understand the attribute will simply ignore it.

This approach complements a media prioritization strategy really well, but before I get to that, I want to take a closer look at Service Workers.

Manipulate requests in a Service Worker

Service Workers are a special type of Web Worker with the ability to intercept, modify, and respond to all network requests via the Fetch API. They also have access to the Cache API, as well as other asynchronous client-side data stores like IndexedDB for resource storage.

When a Service Worker is installed, you can hook into that event and prime the cache with resources you want to use later. Many folks use this opportunity to squirrel away copies of global assets, including styles, scripts, logos, and the like, but you can also use it to cache images for use when network requests fail.

Keep a fallback image in your back pocket

Assuming you want to use a fallback in more than one networking recipe, you can set up a named function that will respond with that resource:

function respondWithFallbackImage() {
  return caches.match( "/i/fallbacks/offline.svg" );
}

Then, within a fetch event handler, you can use that function to provide that fallback image when requests for images fail at the network:

self.addEventListener( "fetch", event => {
  const request = event.request;
  if ( request.headers.get("Accept").includes("image") ) {
    event.respondWith(
      return fetch( request, { mode: 'no-cors' } )
        .then( response => {
          return response;
        })
        .catch(
          respondWithFallbackImage
        );
    );
  }
});

When the network is available, users get the expected behavior:

But when the network is interrupted, images will be swapped automatically for a fallback, and the user experience is still acceptable:

On the surface, this approach may not seem all that helpful in terms of performance since you’ve essentially added an additional image download into the mix. With this system in place, however, some pretty amazing opportunities open up to you.

Respect a user’s choice to save data

Some users reduce their data consumption by entering a “lite” mode or turning on a “data saver” feature. When this happens, browsers will often send a Save-Data header with their network requests. 

Within your Service Worker, you can look for this header and adjust your responses accordingly. First, you look for the header:

let save_data = false;
if ( 'connection' in navigator ) {
  save_data = navigator.connection.saveData;
}

Then, within your fetch handler for images, you might choose to preemptively respond with the fallback image instead of going to the network at all:

self.addEventListener( "fetch", event => {
  const request = event.request;
  if ( request.headers.get("Accept").includes("image") ) {
    event.respondWith(
      if ( save_data ) {
        return respondWithFallbackImage();
      }
      // code you saw previously
    );
  }
});

You could even take this a step further and tune respondWithFallbackImage() to provide alternate images based on what the original request was for. To do that you’d define several fallbacks globally in the Service Worker:

const fallback_avatar = "/i/fallbacks/avatar.svg",
      fallback_image = "/i/fallbacks/image.svg";

Both of those files should then be cached during the Service Worker install event:

return cache.addAll( [
  fallback_avatar,
  fallback_image
]);

Finally, within respondWithFallbackImage() you could serve up the appropriate image based on the URL being fetched. In my site, the avatars are pulled from Webmention.io, so I test for that.

function respondWithFallbackImage( url ) {
  const image = avatars.test( /webmention.io/ ) ? fallback_avatar
                                                 : fallback_image;
  return caches.match( image );
}

With that change, I’ll need to update the fetch handler to pass in request.url as an argument to respondWithFallbackImage(). Once that’s done, when the network gets interrupted I end up seeing something like this:

Next, we need to establish some general guidelines for handling media assets—based on the situation, of course.

The caching strategy: prioritize certain media

In my experience, media—especially images—on the web tend to fall into three categories of necessity. At one end of the spectrum are elements that don’t add meaningful value. At the other end of the spectrum are critical assets that do add value, such as charts and graphs that are essential to understanding the surrounding content. Somewhere in the middle are what I would call “nice-to-have” media. They do add value to the core experience of a page but are not critical to understanding the content.

If you consider your media with this division in mind, you can establish some general guidelines for handling each, based on the situation. In other words, a caching strategy.

When it comes to disambiguating the critical from the nice-to-have, it’s helpful to have those resources organized into separate directories (or similar). That way we can add some logic into the Service Worker that can help it decide which is which. For example, on my own personal site, critical images are either self-hosted or come from the website for my book. Knowing that, I can write regular expressions that match those domains:

const high_priority = [
    /aaron-gustafson.com/,
    /adaptivewebdesign.info/
  ];

With that high_priority variable defined, I can create a function that will let me know if a given image request (for example) is a high priority request or not:

function isHighPriority( url ) {
  // how many high priority links are we dealing with?
  let i = high_priority.length;
  // loop through each
  while ( i-- ) {
    // does the request URL match this regular expression?
    if ( high_priority[i].test( url ) ) {
      // yes, it’s a high priority request
      return true;
    }
  }
  // no matches, not high priority
  return false;
}

Adding support for prioritizing media requests only requires adding a new conditional into the fetch event handler, like we did with Save-Data. Your specific recipe for network and cache handling will likely differ, but here was how I chose to mix in this logic within image requests:

// Check the cache first
  // Return the cached image if we have one
  // If the image is not in the cache, continue

// Is this image high priority?
if ( isHighPriority( url ) ) {

  // Fetch the image
    // If the fetch succeeds, save a copy in the cache
    // If not, respond with an "offline" placeholder

// Not high priority
} else {

  // Should I save data?
  if ( save_data ) {

    // Respond with a "saving data" placeholder

  // Not saving data
  } else {

    // Fetch the image
      // If the fetch succeeds, save a copy in the cache
      // If not, respond with an "offline" placeholder
  }
}

We can apply this prioritized approach to many kinds of assets. We could even use it to control which pages are served cache-first vs. network-first.

Keep the cache tidy

The  ability to control which resources are cached to disk is a huge opportunity, but it also carries with it an equally huge responsibility not to abuse it.

Every caching strategy is likely to differ, at least a little bit. If we’re publishing a book online, for instance, it might make sense to cache all of the chapters, images, etc. for offline viewing. There’s a fixed amount of content and—assuming there aren’t a ton of heavy images and videos—users will benefit from not having to download each chapter separately.

On a news site, however, caching every article and photo will quickly fill up our users’ hard drives. If a site offers an indeterminate number of pages and assets, it’s critical to have a caching strategy that puts hard limits on how many resources we’re caching to disk. 

One way to do this is to create several different blocks associated with caching different forms of content. The more ephemeral content caches can have strict limits around how many items can be stored. Sure, we’ll still be bound to the storage limits of the device, but do we really want our website to take up 2 GB of someone’s hard drive?

Here’s an example, again from my own site:

const sw_caches = {
  static: {
    name: `${version}static`
  },
  images: {
    name: `${version}images`,
    limit: 75
  },
  pages: {
    name: `${version}pages`,
    limit: 5
  },
  other: {
    name: `${version}other`,
    limit: 50
  }
}

Here I’ve defined several caches, each with a name used for addressing it in the Cache API and a version prefix. The version is defined elsewhere in the Service Worker, and allows me to purge all caches at once if necessary.

With the exception of the static cache, which is used for static assets, every cache has a limit to the number of items that may be stored. I only cache the most recent 5 pages someone has visited, for instance. Images are limited to the most recent 75, and so on. This is an approach that Jeremy Keith outlines in his fantastic book Going Offline (which you should really read if you haven’t already—here’s a sample).

With these cache definitions in place, I can clean up my caches periodically and prune the oldest items. Here’s Jeremy’s recommended code for this approach:

function trimCache(cacheName, maxItems) {
  // Open the cache
  caches.open(cacheName)
  .then( cache => {
    // Get the keys and count them
    cache.keys()
    .then(keys => {
      // Do we have more than we should?
      if (keys.length > maxItems) {
        // Delete the oldest item and run trim again
        cache.delete(keys[0])
        .then( () => {
          trimCache(cacheName, maxItems)
        });
      }
    });
  });
}

We can trigger this code to run whenever a new page loads. By running it in the Service Worker, it runs in a separate thread and won’t drag down the site’s responsiveness. We trigger it by posting a message (using postMessage()) to the Service Worker from the main JavaScript thread:

// First check to see if you have an active service worker
if ( navigator.serviceWorker.controller ) {
  // Then add an event listener
  window.addEventListener( "load", function(){
    // Tell the service worker to clean up
    navigator.serviceWorker.controller.postMessage( "clean up" );
  });
}

The final step in wiring it all up is setting up the Service Worker to receive the message:

addEventListener("message", messageEvent => {
  if (messageEvent.data == "clean up") {
    // loop though the caches
    for ( let key in sw_caches ) {
      // if the cache has a limit
      if ( sw_caches[key].limit !== undefined ) {
        // trim it to that limit
        trimCache( sw_caches[key].name, sw_caches[key].limit );
      }
    }
  }
});

Here, the Service Worker listens for inbound messages and responds to the “clean up” request by running trimCache() on each of the cache buckets with a defined limit.

This approach is by no means elegant, but it works. It would be far better to make decisions about purging cached responses based on how frequently each item is accessed and/or how much room it takes up on disk. (Removing cached items based purely on when they were cached isn’t nearly as useful.) Sadly, we don’t have that level of detail when it comes to inspecting the caches…yet. I’m actually working to address this limitation in the Cache API right now.

Your users always come first

The technologies underlying Progressive Web Apps are continuing to mature, but even if you aren’t interested in turning your site into a PWA, there’s so much you can do today to improve your users’ experiences when it comes to media. And, as with every other form of inclusive design, it starts with centering on your users who are most at risk of having an awful experience.

Draw distinctions between critical, nice-to-have, and superfluous media. Remove the cruft, then optimize the bejeezus out of each remaining asset. Serve your media in multiple formats and sizes, prioritizing the smallest versions first to make the most of high latency and slow connections. If your users say they want to save data, respect that and have a fallback plan in place. Cache wisely and with the utmost respect for your users’ disk space. And, finally, audit your caching strategies regularly—especially when it comes to large media files.Follow these guidelines, and every one of your users—from folks rocking a JioPhone on a rural mobile network in India to people on a high-end gaming laptop wired to a 10 Gbps fiber line in Silicon Valley—will thank you.

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