Keep a connected group's inner corners round
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Connected segments and split halves wrote their full corners as --md-sys-shape-corner-full, 9999px, beside 8px inner corners on the same element. A box whose radii add up to more than its side has every radius scaled by one factor, so the inner corners shrank to a hundredth of a pixel and drew square. Full is now half the size's height (--group-full), which no side can overflow. A browser test fails on any radius in a group or split button larger than half its height. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RHoXZSHc8gGpZjFmA5fPc2
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Claude Opus 5
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@@ -15,18 +15,25 @@
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*
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* Split button (`<x-split-button>`): the same idea for two halves; the trailing half turns
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* round and its chevron turns over while its menu is open (SplitButton*Tokens).
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*
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* "Full" here is half the size's height (`--group-full`), never `--md-sys-shape-corner-full`'s
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* 9999px. One element mixes full outer corners with small inner ones, and when a box's radii
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* add up to more than its side, CSS scales every radius by the same factor: a 9999px corner
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* beside an 8px one shrank the 8px one to a hundredth of a pixel, so the inner corners drew
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* square.
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*/
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[data-button-group] {
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--group-inner: var(--md-sys-shape-corner-sm);
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--group-inner-pressed: var(--md-sys-shape-corner-xs);
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--group-full: 1.25rem;
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}
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[data-button-group][data-size='xs'] { --group-pad: 0.75rem; --group-grow: 4px; --group-inner: var(--md-sys-shape-corner-xs); --group-inner-pressed: 2px; }
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[data-button-group][data-size='sm'] { --group-pad: 1rem; --group-grow: 6px; }
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[data-button-group][data-size='md'] { --group-pad: 1.5rem; --group-grow: 8px; }
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[data-button-group][data-size='lg'] { --group-pad: 3rem; --group-grow: 16px; --group-inner: var(--md-sys-shape-corner-lg); --group-inner-pressed: var(--md-sys-shape-corner-md); }
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[data-button-group][data-size='xl'] { --group-pad: 4rem; --group-grow: 20px; --group-inner: var(--md-sys-shape-corner-lg-increased); --group-inner-pressed: var(--md-sys-shape-corner-lg); }
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[data-button-group][data-size='xs'] { --group-pad: 0.75rem; --group-grow: 4px; --group-inner: var(--md-sys-shape-corner-xs); --group-inner-pressed: 2px; --group-full: 1rem; }
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[data-button-group][data-size='sm'] { --group-pad: 1rem; --group-grow: 6px; --group-full: 1.25rem; }
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[data-button-group][data-size='md'] { --group-pad: 1.5rem; --group-grow: 8px; --group-full: 1.75rem; }
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[data-button-group][data-size='lg'] { --group-pad: 3rem; --group-grow: 16px; --group-inner: var(--md-sys-shape-corner-lg); --group-inner-pressed: var(--md-sys-shape-corner-md); --group-full: 3rem; }
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[data-button-group][data-size='xl'] { --group-pad: 4rem; --group-grow: 20px; --group-inner: var(--md-sys-shape-corner-lg-increased); --group-inner-pressed: var(--md-sys-shape-corner-lg); --group-full: 4.25rem; }
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[data-button-group='standard'] > :not([data-icon-button]):active:not(:disabled, [aria-disabled='true']) {
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padding-inline: calc(var(--group-pad) + var(--group-grow));
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@@ -60,19 +67,19 @@
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[data-button-group='connected'] > :is([aria-pressed='true'], :has(:checked)),
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[data-split='trailing'][aria-expanded='true'] {
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--group-corner: var(--md-sys-shape-corner-full);
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--group-corner: var(--group-full);
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}
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[data-button-group='connected'] > :first-child,
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[data-split='leading'] {
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border-start-start-radius: var(--md-sys-shape-corner-full);
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border-end-start-radius: var(--md-sys-shape-corner-full);
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border-start-start-radius: var(--group-full);
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border-end-start-radius: var(--group-full);
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}
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[data-button-group='connected'] > :last-child,
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[data-split='trailing'] {
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border-start-end-radius: var(--md-sys-shape-corner-full);
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border-end-end-radius: var(--md-sys-shape-corner-full);
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border-start-end-radius: var(--group-full);
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border-end-end-radius: var(--group-full);
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}
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[data-split='trailing'] svg {
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