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Fix image structured data
This commit is contained in:
Rohan Kumar
parent
ee498b9745
commit
6ebbd739fd
5 changed files with 47 additions and 35 deletions
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@ -328,15 +328,15 @@ I've discussed loading pages in the background, but what about saving a page off
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{{< transcribed-image type="comic" id="xkcd-1309" >}}
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#### xkcd comic: infinite scrolling {#infinite-scrolling}
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#### <span itemprop="name">xkcd comic: infinite scrolling</span> {#infinite-scrolling}
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{{< transcribed-image-figure id="xkcd-1309" has-transcript="true" >}}
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{{< picture name="infinite_scrolling" alt="Comic: infinite-scrolling books need careful handling to avoid losing the page." >}}
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<figcaption>
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<figcaption itemprop="caption">
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Infinite-scroll means that accidental navigation to a link results in losing your place. Source: [xkcd](https://xkcd.com/1309/).
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Infinite-scroll means that accidental navigation to a link results in losing your place. From [xkcd](https://xkcd.com/1309/ "{itemprop='url'}").
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</figcaption>
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{{< /transcribed-image-figure >}}
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@ -392,14 +392,14 @@ Searchability is a good reason to prefer conveying information textually, when p
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Web pages that hide content behind "show content" widgets are difficult to search through: users need to toggle "show content" for each item they wish to search. Often, in-page search highlights are hidden; [Reddit's atrocious redesign](#reddit-redesign) is a serious offender. If you need to hide some content for performance reasons, I described a less hostile way to do so in [the "other ways to defer content" section](#other-ways-to-defer-content).
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<figure id="reddit-redesign">
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{{<image-figure id="reddit-redesign">}}
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{{<picture name="find" alt="screenshots before/after clicking a \"see more\" link obscuring a search match.">}}
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<figcaption>
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<figcaption itemprop="caption">
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Searching for the word "good" before and after a "see more" link is clicked. Both situations show a match, but only one of them allows us to view the match. Both screenshots are from the Reddit redesign.
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</figcaption>
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</figure>
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{{</image-figure>}}
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### The importance of proofreading
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@ -616,9 +616,9 @@ Chris also describes the importance of visited link colors in <cite>[Visited Lin
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{{< picture name="website_colors" alt="Gray text on a darker gray background. Details in caption." >}}
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<figcaption>
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<figcaption itemprop="caption">
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This is an unreadable screenshot of a [website promoting browser style overrides](http://bettermotherfuckingwebsite.com/). I had set my browser foreground and background colors to white and dark gray, respectively. The website overrode the foreground colors while assuming that everyone browses with a white background.
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This is an unreadable screenshot of <span itemprop="encodesCreativeWork" itemscope itemtype="https://schema.org/WebSite">{{<cited-work name="Better Motherfucking Website" url="http://bettermotherfuckingwebsite.com/">}}</span>. I had set my browser foreground and background colors to white and dark gray, respectively. The website overrode the foreground colors while assuming that everyone browses with a white background.
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</figcaption>
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{{< /transcribed-image-figure >}}
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@ -665,23 +665,23 @@ If you do explicitly set colors, please also include a dark theme using a media
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If you include a `theme-color` directive in your document `<head>`, then recent browsers will automatically switch their default stylesheets to dark-mode. Unfortunately, some older browsers (like Firefox-ESR) don't support this directive, and WebKit's default dark stylesheet [has unreadable links](https://bugs.webkit.org/show_bug.cgi?id=209851). WebKit versions in the wild are often out of date, so a fixed stylesheet would need to be out for many years before I would consider using default dark stylesheets.
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<figure>
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{{<image-figure>}}
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{{<picture name="wk_link" alt="dark blue link on dark gray background.">}}
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<figcaption>WebKit's default dark stylesheet uses dark-colored links that are difficult to read.</figcaption>
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</figure>
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<figcaption itemprop="caption">WebKit's default dark stylesheet uses dark-colored links that are difficult to read.</figcaption>
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{{</image-figure>}}
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CSS filters such as `invert` are expensive to run, so use them sparingly. Simply inverting your page's colors to provide a dark theme could slow it down or cause a user's fans to spin.
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Darker backgrounds draw less power on devices with OLED screens; however, backgrounds should never be solid black. White text on a black background causes halation, especially among astigmatic readers. Halation comes from the word "halo", and refers to a type of "glow" or ghosting around words. There has been some [experimental color research](https://www.laurenscharff.com/research/AHNCUR.html) and plenty of [anecdotal evidence from astigmatic users](https://jessicaotis.com/academia/never-use-white-text-on-a-black-background-astygmatism-and-conference-slides/) to support this.
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<figure>
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<figcaption>
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{{<image-figure>}}
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<figcaption itemprop="caption">
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This image is an approximation of what halation looks like, cropped from <a href="https://www.essentialaccessibility.com/blog/accessibility-for-people-with-astigmatism">Essential Accessibility</a>.
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</figcaption>
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{{< picture name="halation" alt="Fuzzy white text on black background reading \"But it is not\"." >}}
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</figure>
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{{</image-figure>}}
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"Just disable dark mode" is a poor response to users complaining about halation: it ignores the utility of dark themes described at the beginning of this section.
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@ -724,14 +724,14 @@ Some typographers insist that [underlined on-screen text is obsolete](https://pr
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Readers already expect underlined text to signify a hyperlink. Don't break fundamental affordances for aesthetics. Underlines are also necessary to distinguish the beginnings and ends of multiple consecutive links, especially among color-blind users.
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<figure>
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{{<image-figure>}}
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{{<picture name="underlines" alt="Multiple multi-word hyperlinks with and without underlines separating them.">}}
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<figcaption>
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<figcaption itemprop="caption">
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It's impossible to discern the number of links in a sequence without some sort of separator. Whitespace alone isn't sufficient.
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</figcaption>
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</figure>
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{{</image-figure>}}
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A basic WCAG Level A requirement is for information to not be conveyed solely through color.
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@ -1005,14 +1005,14 @@ Designers often use figures to "break up" their content, and provide negative sp
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Small phones typically support display rotation. When phones switch to landscape-mode, vertical space becomes precious. Fixed elements (e.g. dickbars) become a major usability hazard. Ironically, the WCAG's own interactive Techniques reference is a perfect example of how fixed elements impact usability on short screens.
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<figure>
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{{<image-figure>}}
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{{< picture name="wcag_quickref" alt="Website with banner covering top half of screen." sf=1.5 >}}
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<figcaption>
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<figcaption itemprop="caption">
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When filtering criteria on [the Quickref Reference page](https://www.w3.org/WAI/WCAG22/quickref/?currentsidebar=%23col_customize&showtechniques=134%2C124&levels=a&technologies=js%2Cserver%2Csmil%2Cpdf%2Cflash%2Csl), a dickbar lists active filters. I increased the zoom level; you may have to add more filters to fill the screen with a smaller font.
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</figcaption>
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</figure>
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{{</image-figure>}}
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Spacing
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-------
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@ -1031,12 +1031,12 @@ Readers with hand tremors depend on this space to scroll without accidentally se
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Always make sure one non-interactive region exists on the screen at a time, 48 CSS pixels in either dimension; that's the size of a [tap target](#google-tap-target).
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<figure>
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{{<image-figure>}}
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{{<picture name="touch_targets" alt="Phone screen has three touch-targets separated by sections labeled \"space\".">}}
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<figcaption>
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<figcaption itemprop="caption">
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Interactive content should be separated by non-interactive regions, such as whitespace or plain non-interactive text. Image credit: Axess Lab
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</figcaption>
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</figure>
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{{</image-figure>}}
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### Tap targets
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@ -1200,14 +1200,14 @@ a:focus,
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{{</codefigure>}}
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<figure>
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{{<image-figure>}}
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{{< picture name="focus" alt="Screenshots of link outlines: one thin and dotted, one thick and solid." >}}
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<figcaption>
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<figcaption itemprop="caption">
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Top: a screenshot of Firefox's default focus indicator. Bottom: the focus indicator after my adjustments.
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</figcaption>
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</figure>
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{{</image-figure>}}
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Screen reader improve­ments {#screen-reader-improvements}
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-------------------------------
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@ -1344,14 +1344,14 @@ These tests begin reasonably, but gradually grow absurd. Once again, use your ju
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I'm still on step 15, trying to find new ways to break this page. If you come up with a new test, please [share it](mailto:~seirdy/seirdy.one-comments@lists.sr.ht).
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<figure>
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{{< picture name="serenity" alt="Retro-looking web browser with bitmap fonts showing this article's \"Code snippet 7\"." sf=2 >}}
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<figcaption>
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{{<image-figure representative="True">}}
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{{< picture name="serenity" alt="Retro-looking web browser with bitmap fonts showing this article's \"Code snippet 4\"." sf=2 >}}
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<figcaption itemprop="caption">
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This page in the [SerenityOS](https://serenityos.org/) web browser. TLS 1.2 support isn't finished yet; I loaded it from a mirror with a compatible cipher suite.
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</figcaption>
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</figure>
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{{</image-figure>}}
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Future updates
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--------------
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@ -1,6 +1,6 @@
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{{- $canonicalRelPermalink := .RelPermalink | replaceRE "^/~seirdy/" "/" }}
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Posted <time itemprop="dateCreated datePublished" class="dt-published published" datetime="{{ .Date.Format "2006-01-02T15:04:05Z07:00" }}" title="{{ .Date.Format "2006-01-02T15:04:05Z07:00" }}">{{ .Date.Format "2006-01-02" }}</time>
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by {{- partial "indieweb-author.html" -}} on his <a rel="canonical" itemprop="mainEntityOfPage" class="u-url url" href="{{ .Site.Params.CanonicalBaseURL }}{{ $canonicalRelPermalink }}">Website</a>{{- with .OutputFormats.Get "gemtext" -}}{{- printf " " -}}and <a rel="syndication" class="u-syndication" href="{{replace .Permalink "/gemini" "" 1 | safeURL}}">Gemini capsule</a>{{- end -}}.
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by {{- partial "indieweb-author.html" -}} on his <a rel="canonical" itemprop="mainEntityOfPage url" class="u-url url" href="{{ .Site.Params.CanonicalBaseURL }}{{ $canonicalRelPermalink }}">Website</a>{{- with .OutputFormats.Get "gemtext" -}}{{- printf " " -}}and <a rel="syndication" class="u-syndication" href="{{replace .Permalink "/gemini" "" 1 | safeURL}}">Gemini capsule</a>{{- end -}}.
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{{ if lt .Date .Lastmod -}}
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<br>
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Last updated <time itemprop="dateModified" class="dt-updated updated" datetime="{{ .Lastmod.Format "2006-01-02T15:04:05Z07:00" }}" title="{{ .Lastmod.Format "2006-01-02T15:04:05Z07:00" }}">{{ .Lastmod.Format "2006-01-02" }}</time>. <a href="{{ .Site.Params.logUrlPrefix }}content/{{ .File.Path }}">Changelog</a>.
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8
layouts/shortcodes/image-figure.html
Normal file
8
layouts/shortcodes/image-figure.html
Normal file
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@ -0,0 +1,8 @@
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<figure itemscope itemtype="https://schema.org/ImageObject"
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{{- with .Get "id" }} id="{{ . }}"{{ end -}}
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{{- if .Get "representative" }} itemprop="image">
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<meta itemprop="representativeOfPage" content="True">
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{{- else }} itemprop="hasPart">
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{{- end }}
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{{ .Inner | markdownify | safeHTML }}
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</figure>
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@ -87,8 +87,14 @@
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width="{{ $img_width }}" height="{{ $img_height }}"
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src="{{ $light_png.RelPermalink }}" alt='{{ .Get "alt" }}'
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{{ with .Parent -}}
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{{- with .Get "id" -}}
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{{ if eq .Name "transcribed-image-figure" -}}
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{{ with .Get "id" -}}
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aria-describedby="transcript-{{ . }}"
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{{ end }}{{ end -}}
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{{ end -}}
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{{ end -}}
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{{ if or (eq .Name "image-figure") (eq .Name "transcribed-image-figure") -}}
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itemprop="contentURL url"
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{{ end -}}
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{{- end -}}
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decoding="async">
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</picture>{{- /* Strip trailing newline: https://github.com/gohugoio/hugo/issues/1753 */ -}}
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@ -1,5 +1,3 @@
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{{ with .Parent -}}
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<figure>
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{{- end }}
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{{ .Inner | markdownify | safeHTML }}
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</figure>
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