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Update guidance on tap target and non-interactive size

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Rohan Kumar 2022-05-05 15:31:30 -07:00
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6
content/posts/website-best-practices.gmi
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@ -1013,7 +1013,7 @@ The previous "small viewports" section may tempt you to make your content as den
There's an ideal range somewhere between "cramped" and "spaced-apart" content. Finding this range is difficult. The best way to resolve such difficult and subjective issues is to ask your readers for feedback, giving disproportionate weight to readers with under-represented needs (especially disabled readers). There's an ideal range somewhere between "cramped" and "spaced-apart" content. Finding this range is difficult. The best way to resolve such difficult and subjective issues is to ask your readers for feedback, giving disproportionate weight to readers with under-represented needs (especially disabled readers).
### When indentation helps ### Non-interactive space
Excessive indentation can make reading difficult for narrow viewports, but preserving some indentation is still useful. Excessive indentation can make reading difficult for narrow viewports, but preserving some indentation is still useful.
@ -1029,7 +1029,7 @@ Readers who double-tap to jump or zoom can't do so if there's no screen region t
=> gemini://seirdy.one/misc/touch_targets.png Phone screen with three "touch target" rectangles atop each other, separated by blank sections labeled "space". Image from Axess Lab. => gemini://seirdy.one/misc/touch_targets.png Phone screen with three "touch target" rectangles atop each other, separated by blank sections labeled "space". Image from Axess Lab.
Having clearly distinguished links also helps users decide safe places to tap the screen. See the "In defense of link underlines" section for more information. Having clearly distinguished links also helps users decide safe places to tap the screen. See the "In defense of link underlines" section for more information. 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](#tap-target).
### Tap targets ### Tap targets
@ -1037,7 +1037,7 @@ Tap targets should be at least 44 pixels tall and wide according to the WCAG; th
=> https://www.w3.org/TR/WCAG22/#target-size-enhanced WCAG 2.2 Success Criterion 2.5.5: Target Size (Enhanced) => https://www.w3.org/TR/WCAG22/#target-size-enhanced WCAG 2.2 Success Criterion 2.5.5: Target Size (Enhanced)
Google has more aggressive tap-target recommendations: it recommends raising the limit 48 px with with 8 px gaps regardless of whether tap targets are inline, going so far as to make tap target size a ranking factor in search. Google has more aggressive tap-target recommendations: it recommends raising the limit 48 px with with 8 px gaps, going so far as to make tap target size a ranking factor in search.
=> https://web.dev/tap-targets/ Google's tap target guidelines => https://web.dev/tap-targets/ Google's tap target guidelines
On lists without visible bullets, I dropped the default indentation. I had to find other ways to ensure adequate tap-target size and provide sufficient non-interactive space for readers with hand-tremors to scroll. Some examples: On lists without visible bullets, I dropped the default indentation. I had to find other ways to ensure adequate tap-target size and provide sufficient non-interactive space for readers with hand-tremors to scroll. Some examples:

4
content/posts/website-best-practices.md
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@ -1029,6 +1029,8 @@ For now, I've decided to keep some indentation on list elements (`<ol>`, `<dl>`,
Readers with hand tremors depend on this space to scroll without accidentally selecting an interactive element; <span itemprop="citation" itemscope itemtype="https://schema.org/BlogPosting"><span itemprop="publisher">Axess Lab</span> described the issue in {{<cited-work name="Hand Tremors and the giant button problem" url="https://axesslab.com/hand-tremors/" extraName="headline">}}</span>. Readers who double-tap to jump or zoom can't do so if there's no screen region that's "safe to tap". Having clearly distinguished links also helps users decide safe places to tap the screen; see the [section on link underlines](#in-defense-of-link-underlines) for more information. Readers with hand tremors depend on this space to scroll without accidentally selecting an interactive element; <span itemprop="citation" itemscope itemtype="https://schema.org/BlogPosting"><span itemprop="publisher">Axess Lab</span> described the issue in {{<cited-work name="Hand Tremors and the giant button problem" url="https://axesslab.com/hand-tremors/" extraName="headline">}}</span>. Readers who double-tap to jump or zoom can't do so if there's no screen region that's "safe to tap". Having clearly distinguished links also helps users decide safe places to tap the screen; see the [section on link underlines](#in-defense-of-link-underlines) for more information.
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](#tap-target).
<figure> <figure>
{{<picture name="touch_targets" alt="Phone screen has three touch-targets separated by sections labeled \"space\".">}} {{<picture name="touch_targets" alt="Phone screen has three touch-targets separated by sections labeled \"space\".">}}
<figcaption> <figcaption>
@ -1040,7 +1042,7 @@ Interactive content should be separated by non-interactive regions, such as whit
Tap targets should be at least 44 pixels tall and wide [according to the WCAG](https://www.w3.org/TR/WCAG22/#target-size-enhanced); this is large enough to easily tap on a touch&shy;screen. The WCAG makes an exception for inline targets, like links in a paragraph. Tap targets should be at least 44 pixels tall and wide [according to the WCAG](https://www.w3.org/TR/WCAG22/#target-size-enhanced); this is large enough to easily tap on a touch&shy;screen. The WCAG makes an exception for inline targets, like links in a paragraph.
[Google has more aggressive tap-target recommen&shy;dations](https://web.dev/tap-targets/): it recommends raising the limit 48&nbsp;px with with 8&nbsp;px gaps regardless of whether tap targets are inline, going so far as to make tap target size a ranking factor in search. [Google has more aggressive tap-target recommen&shy;dations](https://web.dev/tap-targets/): it recommends raising the limit 48&nbsp;px with with 8&nbsp;px gaps, going so far as to make tap target size a ranking factor in search.
On lists without visible bullets, I dropped the default indentation. I had to find other ways to ensure adequate tap-target size and provide sufficient non-interactive space for readers with hand-tremors to scroll. Some examples: On lists without visible bullets, I dropped the default indentation. I had to find other ways to ensure adequate tap-target size and provide sufficient non-interactive space for readers with hand-tremors to scroll. Some examples: