[benoit74]

Summary

• <interactive-example> (developer.mozilla.org's top "Try it" widget) renders its inner <mdn-play-runner> without the permalink attribute, so that component falls back to crypto.randomUUID() for a session-random id instead of the content-derived hash <mdn-live-sample-result> uses elsewhere on the same page (whose own template already always sets permalink). A fresh random id can never match anything captured in a WARC, so the widget always fails to load on replay — even though its initial, pre-edit code is just as content-stable as the other live-sample widgets that already work; only the id source differs.
• Adds a small SITE_JS_PATCHES table to JsRewriter, keyed by exact hostname (the host of the article URL currently being rewritten, i.e. this JS file's own URL), applied before any other rewriting. Each entry pairs a cheap marker substring check with a regex patch, so the regex only ever runs on content that both matches the host and contains the marker.
• Registers one entry for developer.mozilla.org that adds permalink to <interactive-example>'s three <mdn-play-runner> template variants (choices/console/tabbed).

Deliberately scoped as a content-level fix in the existing rewriting pipeline rather than patching WARC files at crawl time (discussed in openzim/warc2zim#327): the pipeline already hands JsRewriter clean, decoded JS text with no WARC/HTTP framing to worry about, and this follows the same precedent fuzzyRules.js already set for narrow, host-scoped quirk handling inside this general-purpose library.

Verified against the real captured MDN chunk, not just synthetic test fixtures: 3 patches applied when rewritten as developer.mozilla.org, 0 when rewritten as any other host — including lookalikes like developer.mozilla.org.evil.example and notdeveloper.mozilla.org, confirming exact-hostname matching (not a substring/prefix/suffix check) is what gates this.

Fixes #394, found via openzim/warc2zim#327.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (940d1b2) to head (b8e7c59).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #395   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           42        42           
  Lines         2937      2947   +10     
  Branches       450       452    +2     
=========================================
+ Hits          2937      2947   +10     

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