It's really hard to understand how an editable web app does not work on
Firefox because such app does complicated things with minified JS code.
When I investigate what's going on, I used C++ debugger and add break
point to related paths in `|HTMLEditor|`. However, it requires to build
a debug build by yourself and anyway hard to check when unexpected
mutations occurred.
For helping developers to debug the editable web apps in the world, now,
`|HTMLEditor|` has new 2 log modules, `|HTMLEditorMutation|`
<https://searchfox.org/firefox-main/rev/e2cbda2dd0f622553b5c825f319832db4863f6a4/editor/libeditor/HTMLEditorMutationObserver.cpp#40-46>
and `|HTMLEditorAttrMutation|`
<https://searchfox.org/firefox-main/rev/e2cbda2dd0f622553b5c825f319832db4863f6a4/editor/libeditor/HTMLEditorMutationObserver.cpp#94-100> and
they are available in release builds too. The former is for the DOM node
level mutations and the latter is for the attribute mutations of
`|Element|` node. They can log mutations only unexpected one in editable
nodes with `|3|`
<https://searchfox.org/firefox-main/rev/e2cbda2dd0f622553b5c825f319832db4863f6a4/editor/libeditor/HTMLEditorMutationObserver.cpp#60-61,64,66-67,71,73,75,77,79,81,84-85,87,112,115,117-118,120,123>,
log any mutations only in editable nodes with `|4|`
<https://searchfox.org/firefox-main/rev/e2cbda2dd0f622553b5c825f319832db4863f6a4/editor/libeditor/HTMLEditorMutationObserver.cpp#61,64,66-67,71-73,75-77,79-81,84-87,112,115,117-118,120-123>
and log all mutations in the document with `|5|`.
`|MOZ_LOG=HTMLEditorMutation:3,sync|` should be enough for usual
investigation of editable web apps because web-compat issues of editable
web apps are usually caused by mutations of editable nodes by the web app.
Unfortunately, the log is plaintext, so, it may be difficult to read the
related DOM nodes because they are printed with a full path in the DOM
tree. So, I recommend to read the log within a text editor and replace
the path above the relevant editing host with empty string.
--
Masayuki Nakano<masay...@d-toybox.com>
Working on DOM, Events, editor and IME handling for Gecko
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