v1.1.0

Features

• JSON language: New language="json" with dedicated syntax highlighting (property keys vs string values, true/false/null, numbers, punctuation). JSONC // and /* */ comments are displayed but stripped from copy/download so the exported content stays valid (RFC 8259).
• Collapsible sections: New collapsible attribute on <textarea> folds a range of non-interactive lines (GitHub-diff style), with collapsed to start folded. The collapsed band shows the hidden line count (▸ ⋯ N lines); when expanded, a collapse chevron sits in the gutter/margin of the first and last line. Folding is purely visual — copy/download still export the full content. Keyboard accessible (role="button", Enter/Space).
• Button binding type: New type="button" renders a clickable action token that emits a change event on every click (e.detail = its value) with no re-render — ideal for a hub of actions. value is the label (a button<index> default is synthesized when omitted). Exposes a trigger() method.
• Download button: New show-download attribute displays a download button (next to copy) that exports the full content as a file. The file name comes from the optional download="name.ext" attribute or defaults to snippet.<ext> based on the language; MIME type matches the language.
• Gutter rail: A fixed-width left gutter is now reserved whenever the component has line numbers, collapsible sections, or comment toggles — so fold chevrons and comment toggles share a consistent rail. Comment and block-comment toggles moved into the gutter, which preserves the code indentation regardless of comment state (toggling a comment no longer shifts the code). Width is customizable via --code-gutter-width.

Improvements

• Comment toggles no longer shift code: line/block comment indicators are rendered in the gutter (out of flow), so commenting/uncommenting keeps the code aligned. Copy/download output is unchanged.

Tests

• Added src/new-features.spec.ts (13 tests): JSON highlighting, JSONC comment stripping on export, collapsible sections, button type, download, and gutter behavior.
• Fixed a pre-existing XSS test whose assertion checked innerHTML serialization (which legitimately decodes < inside attribute values); it now asserts no <script> element is injected.