mirror of
https://git.sr.ht/~seirdy/seirdy.one
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9d4f18ffde
The WCAG "label in name" SC requires visible labels to contain accessible names, preferably by having accessible names start with visible labels. This commit makes footnote backlinks display as a hyperlink reading "Back" to meet this SC.
469 lines
14 KiB
CSS
469 lines
14 KiB
CSS
/* CSS that adds the bare minimum for a simple, accessible,
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* touch-friendly layout.
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* Nothing here exists purely for aesthetics; everything addresses a
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* specific a11y, compatibility, or critical
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* usability need. The only exception is the h1's top margin.
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*
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* One exception: I re-set the input styles so Safari wouldn't make them
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* pill-shaped.
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*
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* I also don't use any classes except for image presentation. (e.g. to
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* specify that an image should have pixelated rendering or be inverted
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* in dark mode).
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* My HTML contains microformats2 classnames for IndieWeb parsers, but I
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* don't actually use those for styling.
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*
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* To keep myself from caring about minute details, I limited myself to
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* only defining spacing in increments of .25em. Pixels are 1px or
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* multiples of 3px. This also improves compression. No more "finding
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* the perfect value".
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*
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* I cite WCAG 2.2 success criteria with "SC". I also tried to meet
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* the Google a11y requirement of 48px tap targets separated by atl
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* 8px, excluding inline links. This involved increasing font size,
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* padding, line-height, and margins. */
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html {
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/* Mobile screens benefit from greater line-spacing so links are
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* further apart. Dyslexic users prefer the spacing too.
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* Necessary to meet SC 1.4.8.
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* <100dpi screens: sans-serif is better. Why did browsers settle
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* on serif being the default?? */
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font: 100%/1.5 sans-serif;
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/* Nearly every page on my site is taller than the viewport.
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* Paint the scrollbar ASAP to prevent layout shifts. */
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overflow-y: scroll;
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}
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/* This should not take effect on printouts, to save paper. */
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@media screen {
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body {
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/* Default font sizes are one-size-fits-all; they're optimized for a
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* wide variety of complex pages. For single-column websites like
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* mine, it's ideal to bump it up ever so slightly. This also makes
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* <sup>, <sub>, <small>, etc. large enough to have decent contrast
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* with minimal adjustment, and makes tap-targets larger.
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* Only do this on screen, since printouts already improve legibility
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* and cost paper + ink.
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* 108.75% is the minimum required to get superscripts to reach 14.5
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* CSS pixels with most default stylesheets. At that size, my dark
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* color palette has sufficient contrast.*/
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font-size: 108.75%;
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/* Aligning to the center with space on both sides prevents accidental
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* link activation on tablets, and is a common practice that users are
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* more used to for articles. */
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margin: auto;
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/* WCAG recommends a max line width. Not everyone can resize the
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* viewport. This isn't for large blocks of text yet, so we don't have
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* to go by SC 1.4.8.
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* 45em = lowest acceptable width for titles, nav, footers, etc */
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max-width: 45em;
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/* Phone cases can cover the edges. Swipe-from-edge navigations
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* should not conflict with the page elements. Focus outlines for
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* heavily-padded nav links should not be cut-off. All three concerns
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* are addressed by adding some body padding.
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* I followed Google's a11y recommendations of "at least 8px space
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* between tappables" by creating margins/paddings between nav links;
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* re-use that same amount of space here. 24px is what it takes to
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* create atl 48px of non-interactive space on <ul> and <ol> elements
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* containing lists of interactives, with 8px in between.
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* Don't use relative units here; this margin shouldn't scale with
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* zoom, or else text will get narrower with zoom. */
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padding: 0 24px;
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}
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/* 45em is too wide for long body text.
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* Typically meets SC 1.4.8, plus or minus a few characters. */
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div[itemprop="articleBody"] {
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margin: auto;
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max-width: 35em;
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}
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summary {
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/* It's not obvious that a <summary> has button semantics.
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* "cursor: pointer" is used on MDN, web.dev, GitHub, gov.uk, and
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* others so it's not "novel" and won't surprise users. */
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cursor: pointer;
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}
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/* If we have a list of disclosure widgets, we need some
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* non-interactive space on the screen that's safe to tap. */
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form,
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li details {
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margin: .5em 0;
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}
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/* Make superscripts a bit easier to tap. */
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sup > a {
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margin-left: .25em;
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padding-bottom: .25em;
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}
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/* SC 2.5.5, Google a11y: Increase tap target size a bit
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* - Summary is a tappable button
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* - standalone links in lists are usually parts of collections of
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* links that should be easy to fat-finger
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* - links that directly follow h2 without being contained in a
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* paragraph are section permalinks. */
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input,
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div[itemprop="comment"] dd > a,
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dt > a,
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summary,
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nav[itemprop="breadcrumb"] a,
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nav[itemprop="breadcrumb"] > span,
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aside > a, /* Used for section permalinks */
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li > a {
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padding: .75em .25em;
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}
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/* Compensate for misalignment and wasted space caused by padding
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* and margin adjustments in nav children made to meet SC 2.5.5
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* Also prevent overlapping outlines on focus */
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/* We've increased the padding for dt > a, but dt without a link
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* should take up as much space. */
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dt {
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margin: .75em 0;
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}
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dt > a {
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margin: -.75em 0 -.75em -.25em;
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display: inline-block;
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}
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/* <dt> should not be closer to the previous <dd> than the following <dd>.
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* That can happen in webmentions. */
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dd {
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padding-bottom: .25em;
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}
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aside > a {
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margin: -.75em -.25em;
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}
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header a[href="#main"], /* skip link */
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div[itemprop="comment"] dd > a ,
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footer > nav,
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/* List items with direct hyperlink children should only have one hyperlink. */
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li > a,
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aside > a,
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nav ol a {
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margin-left: -.25em;
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display: inline-block;
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}
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/* The nav has to be distant-enough from the top to make room for a skip-link. */
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header > nav {
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margin: .75em 0 0 -.25em;
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display: block;
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}
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/* Multiple consecutive <dt> that share a <dd> shouldn't have tap targets overlap */
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dt + dt > a {
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padding-top: 0;
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}
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nav:not([itemprop="breadcrumb"]) li,
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ol li > a {
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margin: .25em;
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}
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/* Increase backlink tap target size to at least 48x48 */
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a[role="doc-backlink"] {
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display: inline-block;
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margin-left: -.5em;
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padding: .75em .5em;
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}
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/* skip link: make it invisible until focused, and put it on the top. */
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header a[href="#main"] {
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position: absolute;
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top: -2em;
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padding: 0 .25em;
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}
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header a[href="#main"]:focus {
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top: 0;
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}
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}
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/* narrow screens: reduce list indentation, hyphenate nested lists
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* touch screens: lists of links should be easy to tap so give them
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* some spacing (partial SC 2.5.5). There should be non-interactive
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* space to the left that's safe to tap. */
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dd,
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ol,
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ul {
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margin: 0;
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padding-left: 1.5em;
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}
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blockquote,
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ol ol,
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ul ul {
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-webkit-hyphens: auto;
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hyphens: auto;
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margin: 0;
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padding-left: 1em;
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}
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/* Save some space and paper by making the site nav and footer links
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* single-line without bullets. The title should be visible in the fold
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* on most screens so users can identify the current page. */
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/* Step 1 to making the single-line nav: remove the bullet padding. */
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nav ul {
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padding: 0;
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}
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/* Make breadcrumbs inline, so they look familiar. */
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nav[itemprop="breadcrumb"] ol,
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nav[itemprop="breadcrumb"] li,
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nav[itemprop="breadcrumb"] > span {
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display: inline-block;
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}
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nav[itemprop="breadcrumb"] ol {
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margin: -.25em 0;
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padding: 0;
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}
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nav[itemprop="breadcrumb"] li:not(:last-of-type)::after {
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content: "→";
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}
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/* step 2: remove bullets and make elements inline.
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* Also: bump up the line-height and margins to increase space
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* between tap-targets (SC 2.5.5). Google a11y guidelines require 8 CSS
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* pixels between tap targets. */
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nav ul li {
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display: inline-block;
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margin-right: .5em;
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}
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/* narrow screens: we reduce margin for blockquotes a lot, using
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* a border instead. */
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blockquote {
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border-left: 3px solid;
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}
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/* Narrow screens: allow hyphenating titles I can't add soft hyphens to
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* these. Also decrease the top margin a bit; the navbar and breadcrumb
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* list take up plenty of space on top. The latter is a purely
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* aesthetic choice, since it was annoying me a lot. */
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h1 {
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-webkit-hyphens: auto;
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hyphens: auto;
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margin-top: .25em;
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}
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/* Very narrow screens: full hyphenation.
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* This is the typical width of a smart feature phone. */
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@media (max-width: 15em) {
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body {
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font-size: 100%;
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-webkit-hyphens: auto;
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hyphens: auto;
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padding: 0 8px;
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}
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}
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/* <kbd> should be distinguished from <code> and surrounding text
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* in a way beyond font-face; at least two visual distinctions needed
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* Also, Small text is easier to read when slightly bolder.
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* This is important in the dark theme where I set my own colors and
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* try to maintain good perceptual contrast even for small text, but
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* I don't want toggling the theme to impact anything besides color so
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* I set the weight here. */
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dt,
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kbd {
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font-weight: bold;
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}
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/* <ins> should not be mistaken for hyperlinks.
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* "note" roles should look distinct. */
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ins,
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[role="note"],
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[role="doc-tip"] {
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font-style: italic;
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text-decoration: none;
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}
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/* narrow screens: remove unused figure margins
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* figure captions shouldn't look like regular paragraphs; there should
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* be some extra space.
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* This does not hold true for figures in somewhat distinct sections; the
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* section should instead get the spacing. A section that constitutes a
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* separate schema.org object would qualify. */
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section[itemprop="mentions"],
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figure {
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margin: 1.5em 0;
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}
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section[itemprop="mentions"] > figure {
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margin: 0;
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}
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/* browsers make monospace small and unreadable for some dumb legacy
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* reason and this somehow fixes that without overriding the user's
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* font size preferences. */
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code,
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kbd,
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pre, /* Needed for ancient browsers */
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samp {
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font-family: monospace, monospace;
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}
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/* Some browsers don't support the hidden attr.
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* I use hidden spans in backlinks to provide ARIA labels.
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* Some ancient browsers don't support input[type="hidden"] */
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span[hidden],
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input[type="hidden"] {
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display: none;
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}
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/* Remove list style from data feeds. */
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main[itemtype="https://schema.org/DataFeed"] > ol {
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padding: 0;
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list-style-type: none;
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}
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/* Narrow screens: long words can cause content to flow out of the
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* viewport, triggering horizontal scrolling. Allow breaking words in
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* content I don't control (comments, names). For content I do control,
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* I just add soft hyphens to the HTML. */
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div[itemprop="comment"],
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:not(pre) > code,
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:not(pre) > samp,
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span[itemtype="https://schema.org/Person"] {
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overflow-wrap: break-word;
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}
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/* Narrow screens: allow horizontal scroll in a pre block. */
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pre {
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overflow: auto;
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padding: .5em;
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}
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/* Distinguish images from the background in case their color is
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* too similar to the page background color. Also put a border around
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* <pre> and <code> to distinguish them in ways besides font-family.
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* The tappable region of a <summary> extends across the page: we
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* need to tell users that the full space is interactive.
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* This is Technique C25 of SC 1.4.8 */
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input,
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img,
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mark, /* borders provide a distinguishing factor besides color */
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pre,
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summary {
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border: 1px solid;
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}
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/* A black border is too harsh; the extra visual noise is distracting
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* to users with eye-tracking or ADHD. Only special items like headings
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* should draw gaze. */
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:not(pre) > code,
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:not(pre) > samp {
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border: 1px solid #999;
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/* borders shouldn't touch text */
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padding: 0 .25em;
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}
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/* center standalone images; same justification as
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* for centering the body contents. Also makes images easier to see
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* for people holding a device with one hand. */
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div[itemprop="articleBody"] img {
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display: block;
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height: auto;
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margin: auto;
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max-width: 100%;
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}
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audio {
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width: 100%;
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}
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/* Some images look blurry when scaled; this makes them easier to
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* read. */
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.pix {
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image-rendering: pixelated;
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}
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/* Make search box and submit button as wide as possible while keeping
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* them next to each other. */
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/* Use table-style layout (no, not actual tables. eww.). It's like a
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* single-row flexbox that supports more browsers. Kanged this CSS from
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* ww.gov.uk. Give the entire width of the row to the search box, but
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* allow the minimum width for the submit button. */
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legend, /* Makes the <legend> wrap text in some browsers. */
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form > div {
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display: table;
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width: 100%
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}
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input {
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/* Browsers like Safari make the submit button pill-shaped which
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* clashes with the input box. The only purely-cosmetic change on this
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* site. */
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appearance: none;
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/* Don't shrink the size of the text in forms or make it system-ui. */
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font-family: sans-serif;
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font-size: inherit;
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}
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/* A text box should take all available width */
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input:not([type="submit"]) {
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display: table-cell;
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width: 98%;
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}
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/* Pseudo-table-cell containing the submit button */
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form > div > div {
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display: table-cell;
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vertical-align: top; /* IE and some botique browsers need this */
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width: 1%;
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}
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/* Some browser focus indicators are inaccessible; override them with
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* something more visible. See WCAG 2.x SC 2.4.12. I also tried to
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* match browser behavior; mainstream browsers use :focus-visible
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* instead of focus but older/simpler browsers only support :focus.
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* I borrowed these directives from
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* https://www.tempertemper.net/blog/refining-focus-styles-with-focus-visible
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* To my knowledge: <a>, <summary>, and <pre tabindex=0> are the only
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* focusable elements.
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* */
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a:focus,
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summary:focus,
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pre[tabindex]:focus,
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form :focus {
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outline: 3px solid;
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}
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/* Remove :focus styling for browsers that do support :focus-visible.
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* Leave it on for form stuff. */
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@supports selector(:focus-visible) {
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a:focus:not(:focus-visible),
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summary:focus:not(:focus-visible),
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pre[tabindex]:focus:not(:focus-visible) {
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outline: none;
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}
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}
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/* Todo:
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* - Some browsers don't scale SVGs properly; the img container
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* dimensions crop the image rather than scale it. Investigate
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* if this only applies to Internet Explorer or if it applies to
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* other uncommon browsers too. If any non-IE browsers do this and/or
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* if the spec allows this behavior, try to correct it here.
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* - Wait till Webkit fixes its broken-ass default dark stylesheet
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* then consider trimming the dark stylesheet I provide.
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* */
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