Summary: historically in Gecko document.open created a new global and
new session history entry (unless "replace" was passed). We also stored
the written data in a "wyciwyg" cache entry so it could participate
meaningfully in session history. I plan to change these behaviors and
simplify the behavior of document.open to align with the spec and other
browsers. All the "wyciwyg" bits in the tree are being removed in the
process.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1489308
Link to standard:
https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#document-open-steps
Platforms: all
Target release: 67
Devtools bug: none needed.
Other engines: already implement the model we're aligning with, generally.
web-platform-tests:
http://w3c-test.org/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/
There is a certain amount of compat risk here, since this is changing a
very longstanding behavior. I'm hoping that by aligning with the spec
(except for a few edge cases like calling document.open() on a document
whose iframe has been removed from the DOM that we used to no-op and
continue to no-op) and other browsers we keep the risk pretty low.
-Boris
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