From [this comment thread](https://gerrit.wikimedia.org/r/c/mediawiki/extensions/GrowthExperiments/+/737754/2..3#message-fd20d80a3b63f6acf95029ef135cb0a79aed1315):
> This worked well when testing in Safari; in desktop Firefox using the mobile site, I got all kinds of weird behavior – delete key didn't work; the red warning wouldn't go away even after going over 5 characters; clicking back and then going again into the caption entry phase resulted in the caption entry text area being half its normal size. Not sure if we have to do anything about those particular issues right now, just wanted to flag them.
and
> I'm seeing slightly different weird behavior on Firefox on a real device :( The warning did go away after entering more characters, but I was able to delete the children of the caption field (maybe the same 1/2 height behavior you saw). It looks like the LinearDeleteKeyDownHandler isn't called consistently on Firefox, allowing the paragraph node in the ceRecommendedImageCaptionNode to be deleted.
(the update from @Etonkovidova) //Note:// The steps below do not reproduce the issue reliably.
1. Using FF browser emulator , go to one of the
one of the add image articles.
2. Answer "yes" to bring up the caption box. Start typing text, delete some text, type again only three characters (to trigger the warning) , add more characters (to get rid of the warning).
AddAt some point, "Insert paragraph" appears and the caption box becomes unresponsive.
{F34750394}
The following error is displayed in the Console:
```lines=10
Uncaught Error: Incorrect slug location
getOffsetOfSlug https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:426
load.php:426:75
getOffsetOfSlug https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:426
createSlug https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:552
onSlugClick https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:454
<anonymous> self-hosted:1222
jQuery 2
<anonymous> self-hosted:1175
jQuery 12
NoFocusButtonWidget https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:870
setupSlugs https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:454
setupBlockSlugs https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:453
onSplice https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:453
emit jQuery
splice https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:139
splice https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:206
applyTreeOperation https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:210
applyTreeOperations https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:205
process https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:211
process https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:157
commit https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:279
changeInternal https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:240
change https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:240
changeModel https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:570
handleObservedChanges https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:549
pollOnceInternal https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:576
pollOnce https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:576
afterDocumentMouseUp https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:509
<anonymous> self-hosted:1279
(Async: setTimeout handler)
onDocumentMouseUp https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:508
<anonymous> self-hosted:1175
jQuery 8
onDocumentMouseDown https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:508
<anonymous> self-hosted:1175
jQuery 9
VeCeSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:494
createView https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:661
VeUiSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:658
VeUiMWSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1070
createSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1016
createSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:27
createSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1032
addSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:66
addSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1017
setupSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1017
(Async: setTimeout handler)
setupSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1017
(Async: setTimeout handler)
setupSurface https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1016
documentReady https://en.m.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.visualEditor.articleTarget,base,core,diffing,icons,language,mediawiki,mobileArticleTarget,mwalienextension,mwcore,mwextensions,mwformatting,mwgallery,mwimage,mwlanguage,mwlink,mwmeta,mwsave,mwsignature,mwtransclusion,sanitize,supportCheck,switching,welcome|ext.visualEditor.core.mobile,utils|ext.visualEditor.mwimage.core&skin=minerva&version=b3wvt:1015
```