fix: YouTube embed previews render valid referrer #73316
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Avoid nullify the iframe origin in Safari.
Ensure valid referrer is sent to meet YouTube requirements. https://developers.google.com/youtube/terms/required-minimum-functionality#embedded-player-api-client-identity
dcalhoun
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[Type] Bug
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Size Change: -153 B (-0.01%) Total Size: 2.49 MB
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Adapt Sandbox to use srcdoc so that a valid referrer may be sent for YouTube embeds.
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Nov 14, 2025
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| // Using srcDoc instead of blob URL src to preserve referrer | ||
| // context in Safari, allowing YouTube embeds to work correctly. | ||
| srcDoc={ srcDoc } |
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As noted in the comment, using srcDoc rather than a Blob URL preserves the referrer in Safari.
| title={ title } | ||
| tabIndex={ tabIndex } | ||
| className="components-sandbox" | ||
| srcDoc={ srcDocHtml } |
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Using srcdoc rather than writing the HTML to the iframe ensures the referrer is preserved in Safari.
These changes are more complex than the previous commit (6a07db1) approach of simply using WpEmbedPreview for YouTube embed previews. These wider Sandbox changes may have repercussions for other Sandbox usages.
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Closing this as it is unlikely to be the proper solution given how far reaching the changes are. As noted in #73288 (comment), this issue appears to originate from a bug in the Safari browser. |
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Important
This was opened primarily for demonstrative purposes. We need to better understand the implications of these changes before merging this. These changes likely have repercussions, there may also be a better approach altogether.
What?
Relates to #73288. Fix failing YouTube embed previews in Safari.
Why?
YouTube embed previews currently fail with
Error 153due to YouTube's new policies requiring a valid referrer.How?
iframeto usesrcDocrather than aBlobURL so that a validoriginis set.Allow YouTube embeds to useWpEmbedPreviewrather thanSandboxto pass along the referrer.Sandboxto usesrcDocrather than writing to the document to preserve the referrer.Testing Instructions
See #73288.
Testing Instructions for Keyboard
N/A, no navigation changes.
Screenshots or screencast
N/A, no visual changes.