DOMCompat::querySelector( $fragment, 'mw\\:editsection' ) throws "InvalidArgumentException: Unknown Selector: :editsection" (when $fragment is a DOMDocumentFragment). It works when called on a DOMElement.
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Event Timeline
Change 1004290 had a related patch set uploaded (by Bartosz Dziewoński; author: Bartosz Dziewoński):
[mediawiki/libs/Zest@master] Fix matching tag names that require escaping in doc fragments
Change 1004291 had a related patch set uploaded (by Bartosz Dziewoński; author: Bartosz Dziewoński):
[mediawiki/extensions/DiscussionTools@master] Remove workaround for T357812
Change 1006092 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/libs/Zest@master] Correctly handle tag and class names with special characters
Change 1004290 abandoned by Bartosz Dziewoński:
[mediawiki/libs/Zest@master] Fix matching tag names that require escaping in doc fragments
Reason:
Let's use Scott's version
Change 1006092 merged by jenkins-bot:
[mediawiki/libs/Zest@master] Correctly handle tag and class names with special characters
Change 1010291 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/vendor@master] Update wikimedia/zest-css to 3.0.1
Change 1010292 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/services/parsoid@master] Bump wikimedia/zest-css dependency to 3.0.1
Change 1010291 merged by jenkins-bot:
[mediawiki/vendor@master] Update wikimedia/zest-css to 3.0.1
Change 1010292 merged by jenkins-bot:
[mediawiki/services/parsoid@master] Bump wikimedia/zest-css dependency to 3.0.1
Change 1011398 had a related patch set uploaded (by C. Scott Ananian; author: C. Scott Ananian):
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.19.0-a23
Change 1011398 merged by jenkins-bot:
[mediawiki/vendor@master] Bump wikimedia/parsoid to 0.19.0-a23
Change #1004291 merged by jenkins-bot:
[mediawiki/extensions/DiscussionTools@master] Remove workaround for T357812