Can't change a line to h1
Text align button has similar issue.
Steps for Reproduction
Expected behavior:
The selected paragraph should switch to <h1>
Actual behavior:
Heading isn't set.
The editor loses focus.
Platforms:
Firefox 46 on Windows 7
Version:
1.0-Beta.2
I'm having troubling reproducing this on FF46/Win8.1. Can you include the specific text you are selecting before trying to apply the heading?

No matter what text I'm selecting it has no effect.
I've tried selecting the same text as you (WYSIWYG) and the heading button does nothing.
Tested with Firefox 46 and Chrome 50 on Windows 7.
Not sure why it work for you but not for me.
Can someone else try to reproduce?
Screen capture of the issue
https://drive.google.com/file/d/0B12AhxvnYHrAWDJfT2Vza1ItMkk/view
Firefox 46 on Ubuntu 16.04
I can reproducing this bug on Google Chrome and Firefox (Fedora x64)
i think bug in toolbar button events. if i clicked very fast editor working. But if i do onmousedown on the button, button disappears, mouse doing onmosemove on other element, focus lost, and i cant do onmouseup on the button and doing onmouseup on different element
Thanks for the insight @mgkirs. Another commit seems to have already fixed this on the 1.0 branch. @benbro can you confirm on beta.quilljs.com. I updated it with a new build so in the console Quill.version should return "1.0.0-beta.2-5aa302" now.
Working now on beta.quilljs.com
Thanks
Most helpful comment
No matter what text I'm selecting it has no effect.
I've tried selecting the same text as you (WYSIWYG) and the heading button does nothing.
Tested with Firefox 46 and Chrome 50 on Windows 7.
Not sure why it work for you but not for me.
Can someone else try to reproduce?