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fix(dom): drop comment nodes inside <style> when cloning (PER-11066) - #2464
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Lit leaves empty marker comments in a <style> that contains a binding. Since #2393 they are cloned and serialized as a literal <!----> inside the CSS, which makes the parser drop the following declaration (display:flex in PER-11066, collapsing a gap layout). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
📝 Walkthrough📝 WalkthroughCloning skips comment nodes whose parent is a Changes: Style comment cloning
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to
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The title includes the valid Jira ID PER-11066 and clearly describes dropping comment nodes inside <style> elements during cloning. |
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/dom/test/serialize-css.test.js:
- Line 568: Update the assertion in the relevant test to call
window.getComputedStyle instead of the unresolved bare getComputedStyle,
preserving the existing selector and expected display value.
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📒 Files selected for processing: 2
packages/dom/src/clone-dom.jspackages/dom/test/serialize-css.test.js
🔗 Linked repositories identified
CodeRabbit considers these linked repositories for cross-repo context during reviews:
percy/percy-selenium-dotnet(auto-detected)percy/example-percy-appium-java(auto-detected)percy/percy-appium-java(auto-detected)percy/example-percy-automate-appium-python(auto-detected)percy/example-percy-automate-appium-javascript(auto-detected)percy/example-percy-appium-js(auto-detected)percy/example-percy-appium-python(auto-detected)percy/example-percy-appium-dotnet(auto-detected)percy/example-percy-appium-ruby(auto-detected)percy/example-percy-maestro-app(auto-detected)percy/puppeteer(auto-detected)percy/percy-storybook(auto-detected)percy/example-percy-automate-appium-dotnet(auto-detected)
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🧰 Additional context used
🪛 ESLint
packages/dom/test/serialize-css.test.js
[error] 568-568: 'getComputedStyle' is not defined.
(no-undef)
🪛 GitHub Actions: Lint / 0_Lint.txt
packages/dom/test/serialize-css.test.js
[error] 568-568: ESLint failed during yarn lint: 'getComputedStyle' is not defined. (no-undef)
🪛 GitHub Actions: Lint / Lint
packages/dom/test/serialize-css.test.js
[error] 568-568: yarn lint failed: ESLint reports 'getComputedStyle' is not defined (no-undef).
🔀 Multi-repo context percy/percy-storybook, percy/percy-appium-java
Linked repositories findings
percy/percy-storybook
yarn.lock:2361-2367pins@percy/core@1.32.7, which depends on@percy/dom@1.32.7; the lockfile resolves that DOM package at1.32.7(yarn.lock:2384-2387). Updating this dependency will be needed for Storybook users to receive the fix. [::percy/percy-storybook::]
percy/percy-appium-java
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yarn.lock:139-145shows@percy/core@1.26.2depending on@percy/dom@1.26.2, resolved atyarn.lock:156-159. This is an older pinned DOM version and is not a direct consumer of the changed internal API. [::percy/percy-appium-java::] -
No linked repository contained direct references to
cloneNodeAndShadow,serialize-css, or the reported Lit marker comment. [::percy/percy-appium-java::]
🔇 Additional comments: 1
packages/dom/src/clone-dom.js: 1
65-71: LGTM!
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude Code PR ReviewPR: #2464 • Head: f911f28 • Reviewers: fallback inline checklist (built-in review; no in-scope reviewers installed) SummarySkips cloning Comment nodes whose parent is a Review Table
Findings
Verdict: PASS |
3 participants
What
cloneNodeAndShadowno longer clones Comment nodes whose parent is a<style>.Why (PER-11066)
Since #2393 (
1c1d159d, first released in 1.32.8-beta.0), a<style>is cloned through the generic child walk instead of being rewritten fromtextContent. Lit and other template libraries leave empty marker comments inside a<style>that contains a binding, e.g.html`<style>.grid { ${gridStyle} }</style>`, whose childNodes are#text, #comment, #text, #text, #comment. Those comments are now cloned and serialized as a literal<!---->inside the CSS:On replay, CSS tokenizes
<!--/-->as CDO/CDC, and declaration error recovery dropsdisplay: flex.gapis then inert, so the customer's cards rendered flush against each other in the snapshot while the live page was fine.Before #2393 this was masked: the comment-free
textContentcopy came first in the clone, so the rule applied.Evidence
The same Lit page was serialized and then replayed with JS off in Chrome:
.griddisplayThe customer's build shows the same thing: head (cli 1.32.11) is 2400px tall and base (cli 1.32.7) is 2640px. The difference is 240px, which is 15 gaps × 16px.
Change
packages/dom/src/clone-dom.js: skipCOMMENT_NODEchildren of astyleelement. The check is case-insensitive, so SVG<style>is covered too. A comment node is never part of the stylesheet (the CSS comes only from the text children), so dropping it can't change anything the browser renders.packages/dom/test/serialize-css.test.js: regression test that builds a<style>with comment children around a rule and asserts the serialized text has no<!--and equals the livetextContent.🤖 Generated with Claude Code
Summary by CodeRabbit
<style>elements could be copied into cloned DOMs and interfere with CSS. CSS declarations remain effective, and serialization omits the comment markup while preserving the style element’s text content.