Adrian Tamas (:AdrianT) Reporter
	Description • 12 years ago

Nightly 17.0a1 2012-08-20/Firefox Mobile 15 RC build 1
Device: Samsung Galaxy Tab (Android 3.1)/ Samsung Note (Android 4.0.4)/ Motorola Droid 3 (Android 2.3.4)

Steps to reproduce:
1. Go to kickstarter.com and find a project presentation page with a video on it or alternatively go to the link from the URL field of the bug
2. Tap the Play icon and wait for the flash activation plugin placeholder to be displayed
3. Tap on the placeholder to activate the plugin

Expected results:
Both the placeholder and the flash video are correctly displayed

Actual results:
The plugin placeholder is displayed half the height under the bottom edge.

Note:
Please see the videocapture: http://youtu.be/oGqoAVZRYOA
The issue is not reproducible on the Android Stock Browser using the plugin "on demand" option set. 
Issue is reproducible using Nightly 2012-01-01 so it is most likely not a regression.

	Mark Finkle (:mfinkle) (use needinfo?)
	Comment 1 • 12 years ago

Can we investigate the markup issue?

	Martijn Wargers (dead)
	Comment 2 • 12 years ago

This is happening because of the xul:vbox class="mainBox" is aligned too low.
The testcase here, the red bordered div represents this xul:vbox.
When using vertical-align: top style, the problem seems to go away.

Btw, this is not a problem in quirks mode.

	Martijn Wargers (dead)
	Comment 3 • 12 years ago

This is a general issue with the Tap to Play placeholder, not only Firefox for Android.

	Daniel Holbert [:dholbert]
	Comment 4 • 12 years ago

The bug exposed by mw22's testcase is a layout issue involving baselines of -moz-box elements. I filed bug 793007 on it.

> Btw, this is not a problem in quirks mode.

(Actually, it's a general problem -- it does affect quirks mode, but *only* if you add some text next to the -moz-box element, for it to baseline-align with.  Apparently we have a quirks-mode quirk to disable baseline-alignment when there's only one child in a block, or something like that, and that quirk is what saves us in a quirks-mode-but-otherwise-unmodified variant of mw22's testcase here.)

Anyway -- Bug 793007 has a description of the layout bug & a simple testcase.

It's likely the extent of the problem here, so this bug can probably be resolved once that bug is fixed.  (I spun it off as a separate bug just in case case that bug's fix doesn't end up completely resolving the original issue here.)