[pull] master from lxml:master #92
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Before this commit: `lxml.html.clean.Cleaner` striped all ARIA attributes (e.g., aria-label, aria-hidden, role) by default. This is because they were not included in the "safe attributes" whitelist. This behavior caused sanitized HTML to lose semantic meaning for assistive technologies (screen readers), making the output non-compliant with WCAG standards. After this commit: ARIA attributes are added to `defs.safe_attrs` so the Cleaner will no longer filter them out. This change ensures that developers using lxml for sanitization will not accidentally strip accessibility features while maintaining protection against XSS. Closes https://bugs.launchpad.net/bugs/2136144
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