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Let <x-icon> pick the optical size 20 cut

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M3's optical size axis redraws a symbol so its strokes look equally heavy at
every size; drawing the 24 cut at 20px thins them by about a sixth (styles.md
§ Icons). `optical` picks the cut — 24 by default, 20 for an icon drawn at 20px
or smaller — and combines with `filled`; anything else falls back to 24, so no
caller can land on a folder that does not exist. SvgFile::symbol() takes the
size as a fourth argument and resolves the `-20` folders; the catalogue is the
same in both cuts, so symbolNames() and DesignGuard's icon-name check are
unchanged. The callers that size their own icons pass it in a later step.

Plan step 10; finding C16.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
This commit is contained in:
Andreas Reinhold / reini
2026-09-14 04:04:32 +02:00
co-authored by Claude Fable 5.1
parent c22d693334
commit 699827d696
4 changed files with 89 additions and 15 deletions
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resources/boost/skills/livewire-material-development/SKILL.md
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@@ -179,15 +179,18 @@ Your export is ready.
### `<x-icon>`
A Material Symbol (Rounded, weight 400, grade 0, 24px), inline. Every symbol on fonts.google.com/icons exists, by Google's name with underscores. An unknown name throws.
A Material Symbol (Rounded, weight 400, grade 0), inline. Every symbol on fonts.google.com/icons exists, by Google's name with underscores. An unknown name throws.
| Prop | Default | |
|---|---|---|
| `name` | required | `calendar_month`, `cloud_upload`, `content_copy` |
| `filled` | `false` | the filled symbol — M3 uses it for active or selected |
| `optical` | `24` | the cut the glyph is drawn from, `24` or `20`; anything else falls back to 24 |
| `label` | `null` | names the icon for screen readers when it carries the meaning alone; otherwise it is `aria-hidden` |
24px (`size-6`) unless a `size-*`, `w-*` or `h-*` class is passed. Colour follows the text: `<x-icon name="lock" class="size-5 text-on-surface-variant" />`.
24px (`size-6`) unless a `size-*`, `w-*` or `h-*` class is passed. Colour follows the text: `<x-icon name="lock" class="size-5 text-on-surface-variant" optical="20" />`.
M3's optical size axis redraws a symbol so its strokes look equally heavy at every size, so **an icon drawn at 20px or smaller (`size-5` and below) takes `optical="20"`**; scaling the 24 cut down thins its strokes by about a sixth. The cut is not a size — pass both, and where a component sizes an icon for you, pass the cut alongside the size class.
### `<x-shape>`