Post

Luke

@lukewarlow.dev

We *really* need a specification for hit testing on the web...

6/10/25, 6:06 pm0 reposts8 likes

Philip Jägenstedt

@foolip.org

6 Oct 2025

What's the occasion this time?

Luke

@lukewarlow.dev

6 Oct 2025

I'm working on a new function for the cssom-view spec which is based on hit testing. Found out the existing ones behave inconsistently, WebKit is consistently 'wrong', servo is consistently 'right', chromium and firefox are inconsistent. Specifically this issue was around display:contents elements.

Luke

@lukewarlow.dev

6 Oct 2025

The spec has to do some "do the thing" for hit testing because there's no definition to link to though.

Ian Grunert

@iangrunert.bsky.social

6 Oct 2025

"Hit testing will hopefully be defined in a future revision of CSS or HTML." - 4 August 2011 www.w3.org/TR/2011/WD-c...

w3.orgCSSOM View Module

Philip Jägenstedt

@foolip.org

6 Oct 2025

Yeah, this has been a problem for a long time. Maybe start a spec with a few things implementations agree on and expand from there? The known issues could be longer than the normative text!