See http://download.dojotoolkit.org/release-1.7.3/dojo-release-1.7.3/dijit/tests/test_Toolbar.html, which demonstrates a nasty jitter on hovering the toolbar buttons.
The root issue is that a node is getting a computed style of -webkit-transition-property of "all" even though the CSS is setting it to "background-color". You can see that on node id="inner" of the attached (simplified) test case.
Hovering toolbar buttons is switches between padding==border==1px <--> padding==2px, border==0px. That shouldn't cause a jitter, and especially it shouldn't since neither border nor padding are set as transition-properties.
Created attachment 150602 [details]
simplified test case. use "remove hover" and "show hover" buttons to show screen jitter around the word "BOLD"
Oh, it's because there are two transition-duration's listed but only one transition-property:
-webkit-transition-duration: 0.3s, 0.35s;
Fixing that fixes the problem.
So, mainly a user error.
I'm not sure though what the "correct" behavior is when those two lengths don't match.
Also, still seems mildly wrong that any setting of -webkit-transition-property and -webkit-transition-duration should cause a screen jitter, unless the padding and border were being changed at a different rate.
(In reply to comment #2)
> I'm not sure though what the "correct" behavior is when those two lengths don't match.\
The spec says.
> Also, still seems mildly wrong that any setting of -webkit-transition-property and -webkit-transition-duration should cause a screen jitter, unless the padding and border were being changed at a different rate.
OK. What's the URL of the spec are you talking about, and what does it say?
I found http://www.w3.org/TR/css3-transitions/#transition-duration-property for transition-property but it didn't say anything about the second parameter.
"In the case where the lists of values in transition properties do not have the same length, the length of the ‘transition-property’ list determines the number of items in each list examined when starting transitions. The lists are matched up from the first value: excess values at the end are not used. If one of the other properties doesn't have enough comma-separated values to match the number of values of ‘transition-property’, the UA must calculate its used value by repeating the list of values until there are enough. This truncation or repetition does not affect the computed value."