{
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    "description": "Each digest is sha256 over the UTF-8 bytes of the first <main>...</main> region extracted from the raw HTML response -- NOT the full page. This mirrors recheck/google's sources.json normalization in spirit, but Microsoft's style-guide pages do NOT exhibit the same per-request non-determinism Google's pages had: two consecutive curl fetches of every page below, several seconds apart, produced BYTE-IDENTICAL full HTML responses every time (verified empirically, not assumed -- see the fetch log referenced in PROVENANCE.md). The <main> region is extracted anyway, for the same reason Google's provenance extracts <article>: it is the guide's actual rendered content (headings, paragraphs, lists, tables) and is a narrower, more meaningful unit than the raw page even when the raw page itself happens to be stable today.",
    "extractionPattern": "<main[\\s\\S]*?</main>",
    "extractionFlags": "first match, dot-matches-newline via [\\s\\S]",
    "hashedBytesField": "bytes -- the byte length of the EXTRACTED <main> region (UTF-8), not the raw page. A future re-check with a matching bytes but different sha256 (or vice versa) signals the extraction may have changed shape rather than the content, and should be triaged before treating it as drift.",
    "httpStatusField": "httpStatus -- fix wave B / Step 6: added so a dead URL (a 404, or any non-200) is distinguishable from a live one at a glance, rather than only visible by noticing an entry's bytes/sha256 happen to collide with another entry's (which is exactly how the two pre-existing dead entries this wave fixed were found -- both hashed Microsoft's 404 page, identical bytes: 1898 / sha256: 0ea4f717..., for two different URLs, with 'reproducible: true' technically true but vacuous since a 404 page is trivially reproducible). Every entry below was re-verified at httpStatus 200 as of the fetch date in this wave.",
    "fetchMethod": "curl -- matches the four verification passes (task-10-verify-{E,F,G,H}.md) and recheck/google's own sources.json precedent (a plain Node fetch() was confirmed there to return a materially different HTML variant of the same URL than curl does). A future re-check must fetch with curl, not fetch() or another HTTP client.",
    "reproducibilityCheck": "Every page below was fetched TWICE, several seconds apart; the extracted <main> region was byte-identical both times for all of them (see reproducible: true on every entry) -- confirmed empirically, not assumed."
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