[Bug 107247] Re: A Web page can temporarily turn on caret browsing

[Matthew Paul Thomas]

** Summary changed:

- cursor-key navigation in bugs broken with Firefox
+ A Web page can temporarily turn on caret browsing

** Description changed:

- I'm used to being able to click in the body text of a bug and then use
- the up and down cursor keys to scroll the whole page up and down. As of
- today's Launchpad rollout (but not before), I instead get an I-beam
- cursor positioned where I clicked, and then the up and down cursor keys
- move that cursor up and down, which is significantly less useful -
- existing bug comments (for example) shouldn't be editable so an I-beam
- cursor is inappropriate.
+ It is possible for a Web page to turn on Firefox's "caret browsing" mode
+ just for that page, such that Firefox displays a cursor in the Web page
+ text and prevents scrolling from working as normal. This should never
+ happen.
  
- Moving to a different tab in Firefox and then moving back again seems to
- restore normal cursor-key behaviour, so I'm not ruling out a Firefox
- bug, but I haven't upgraded Firefox recently and this behaviour only
- started today.
+ This bug was triggered by bug 107376 in a previous version of Launchpad,
+ suggesting that the general cause is JavaScript focusing a text field,
+ and then using CSS to hide that field. It seems unrelated to the
+ document.designMode DOM property, because the page did not become
+ editable.
  
  Steps to reproduce:
- 1. open a bug page
+ 1. in the mpt/launchpad/2007-04-firefox-caret branch, open a bug page
  2. click once in the bug page
  3. press the Up or Down arrow keys.
- 
- Bug 107376 might be the cause

-- 
A Web page can temporarily turn on caret browsing
https://bugs.launchpad.net/bugs/107247
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