Trying to use reply tool at https://cs.wikipedia.org/wiki/Wikipedie:Diskuse_o_smaz%C3%A1n%C3%AD/Hana_Krampolov%C3%A1?dtenable=1&uselang=en fails for almost all comments. However, trying to use the same reply tool at https://cs.wikipedia.org/wiki/Wikipedie:Pod_l%C3%ADpou_(technika)?dtenable=1#Chybová_hláška_u_diskuzních_nástrojů works with no problems.
See screencast: https://commons.wikimedia.org/wiki/File:T260061-discussion-tools-reply-link-bug-ie11.webm
Browser details:
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| utils: Avoid Node#contains for IE 11 support | mediawiki/extensions/DiscussionTools | master | +18 -2 |
I can reproduce this.
I trusted MDN documentation about this, which says 'contains' is supported even as far back as IE 9: https://developer.mozilla.org/en-US/docs/Web/API/Node/contains – but it clearly isn't.
It appears that 'contains' is supported on HTMLElement objects, but not on other Node objects (e.g. text nodes). There is a note about this in the MDN docs, but it's unclear.
Change 619356 had a related patch set uploaded (by Bartosz Dziewoński; owner: Bartosz Dziewoński):
[mediawiki/extensions/DiscussionTools@master] utils: Avoid Node#contains for IE 11 support
Change 619356 merged by jenkins-bot:
[mediawiki/extensions/DiscussionTools@master] utils: Avoid Node#contains for IE 11 support