Snapshot the margin* attributes on frame/iframe at document creation #11887
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This effectively removes a cross-origin communication channel. Fixes #2486.
annevk
reviewed
Nov 5, 2025
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| <p>Each <code>Document</code> has a boolean <dfn | ||
| data-x="document-embedder-has-margin-attributes">embedder has margin attributes</dfn>, initially | ||
| false.</p> |
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Does caching it here mean we want it to be able to be different across navigations? Including possibly being different between a bfcache back and an ordinary back?
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This effectively removes a cross-origin communication channel. Fixes #2486.
(This is on top of #11881.)
(See WHATWG Working Mode: Changes for more details.)
/document-lifecycle.html ( diff )
/document-sequences.html ( diff )
/dom.html ( diff )
/rendering.html ( diff )