docs(session-replay): document srcdoc iframe blocking and unblock#18825
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Same-origin srcdoc iframes are blocked by default via the internal `iframe[srcdoc]:not([src])` selector, but this wasn't documented. Clarify that `unblock` takes precedence over all blocking (not just `blockAllMedia`), list the internal default block list, and add a troubleshooting entry for empty iframes pointing to `unblock: ['iframe[srcdoc]']`. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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chargome
approved these changes
Jul 24, 2026
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Documents that same-origin
srcdociframes are blocked by default in Session Replay, which currently isn't mentioned anywhere. Users see empty iframe placeholders with no clear reason or fix.unblocktakes precedence over all blocking, not justblockAllMedia.base,iframe[srcdoc]:not([src])) and why srcdoc iframes are blocked (masking can't run inside them).unblock: ['iframe[srcdoc]'], with the unmasked-content caveat.Reported in getsentry/sentry-javascript#8241 follow-up and getsentry/rrweb#263.
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