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Miao Yang
e43b377fc0
A CSS identifier cannot start with a digit, so an authored rule like
`#01-wall-pushes-back { ... }` is an invalid selector and the browser drops
the whole rule — taking the root's size/background with it. A full
composition masks this (the host stretches/paints the frame), but a
standalone preview has no host, so the root collapses to height:0 +
transparent and renders blank.
extractFullDocumentParts now rewrites `#<digit-leading-id>` selectors to
their escaped valid form (`#\30 1-...`, still matching the element id),
scoped to ids actually present and matched only as `#id` not followed by an
ident char so hex colors are never touched. Also harden the <template>
inner-HTML extraction to use the DOM instead of a greedy regex. Tests added.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>