w3c/csswg-drafts
Vedi su GitHub[cssom-view] offsetTop/Left spec seems to be pretty confused when scrolling is involved
Open
#1832 aperta il 25 set 2017
Help Wantedcssom-view-1
Metriche repository
- Star
- (3546 star)
- Metriche merge PR
- (Merge medio 87g 7h) (24 PR mergiate in 30 g)
Descrizione
Simple testcase:
<div id="parent" style="overflow:scroll; height: 100px; position: relative">
<div id="spacer" style="height: 200px"></div>
<div id="child" style="border: 1px solid green"></div>
</div>
Load this, scroll the scrollable div all the way down, examine "child.offsetTop". It comes back as "200" in browsers. The spec at https://drafts.csswg.org/cssom-view/#dom-htmlelement-offsettop, on the other hand says:
Return the result of subtracting the y-coordinate of the top padding edge of the first CSS layout box associated with the offsetParent of the element from the y-coordinate of the top border edge of the first CSS layout box associated with the element, relative to the initial containing block origin, ignoring any transforms that apply to the element and its ancestors.
and in this case this is definitely not 200. The spec is wrong and needs to be fixed, afaict.