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Validate duplicate attributes

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@hugithordarson hugithordarson released this 03 Sep 16:11
· 160 commits to master since this release
v5.2.1
e710a6f

Validate duplicate attributes

Tags with duplicate attributes — e.g. `` — now produce a validation error. The first occurrence wins (per the HTML spec) and the duplicate is highlighted in the editor and Problems view. Detection is case-insensitive, so class and `Class` are correctly flagged as duplicates.

From the changelog, April 12, 2026.

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