<p>Whereas, in Firefox, 'mouseup' and 'click' happen.</p>
<p>Below is the experiment.</p>
<div class="embed-wrapper"><div class="embed-loading"><div class="loadingRow"></div><div class="loadingRow"></div></div><a class="embed-card" href="https://codepen.io/bada3670/pen/YzLVKxM">https://codepen.io/bada3670/pen/YzLVKxM</a></div>


Whereas, in Firefox, 'mouseup' and 'click' happen.

Below is the experiment.

%[https://codepen.io/bada3670/pen/YzLVKxM]

examplist

examplist

In Chrome, If 'alert()' Is in 'mousedown' Handler, 'mouseup' and 'click' Don't Happen.