Tooltip not reflecting updated content set on a timeout

[Michael Leibman]

What steps will reproduce the problem?
1. Attach an onmouseover event to an element with a 'title' attribute.
2. In the handler, set the timeout to execute a function that will change the 'title' attribute 100ms after the event.
3. Quickly mouse over the edge of the element.  Try to cross the border but not move the mouse around inside the element.

What is the expected result?
System tooltip pops up on hover showing the new tooltip text.


What happens instead?
System tooltip shows the old tooltip text.


Test case:
http://jsfiddle.net/rCpqu/


<div id="myDiv" title="tooltip" style="padding:10px;background:pink">Hover me</div>

var el = document.getElementById('myDiv');


el.onmouseover = function() {
    setTimeout(function() {
        el.title = 'new tooltip';
    }, 150);
}

el.onmouseout = function() {
    el.title = 'tooltip';
}

[Ahmad Saleem]

Marking this as 'New' because at least Firefox Nightly 125 is not showing old tooltip on quick hover while showing consistently `new tooltip` as for Safari 17.4 and Chrome Canary 124, it is reproducible and on quick hover, it do show 'tooltip' instead of 'new tooltip' on time to time basis.

Might be worth to change it from `WebKit Misc` to `Layout & Rendering`?

[Karl Dubost]

Ahmad, 
I guess I do not know how to test this properly, because I get the same behavior everywhere.

[Radar WebKit Bug Importer]

<rdar://problem/124417555>

[Ahmad Saleem]

Created attachment 470306 [details]
Safari 17.4 Reference Video

In reference video, `tooltip` is show when I quickly do hover, while in Firefox even quickly, it does always show `new tooltip` while in Safari, we do go in between `new tooltip` and `tooltip` as show in video.