Duplicate IDs + canonical/hreflang - #260
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getElementById returns the first match, so label[for], aria-* references, and #anchors silently bind the wrong node when an id repeats. Flagged with the id and its count.
Multiple canonical links (search engines see conflicting URLs) and empty-href hreflang alternates (a language variant pointing nowhere) join the meta audit.
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Two more silent-failure classes. Duplicate ids: getElementById returns the first match, so a repeated id makes label[for], aria-* references, and #anchors bind the wrong node — invisibly. Canonical/hreflang: multiple canonical links make search engines see conflicting URLs (they may ignore all of them), and an empty-href hreflang alternate points a language variant nowhere. Both live-tested. Local check green; merge gated on PR CI.