Reason for document.scrollingElement to be document.documentElement

[Martin Kadlec]

Hi,

for some reason, on my mac in latest Chrome versions, the document.scrollingElement property is document.documentElement instead of document.body. The document.compatMode is 'CSS1Compat' so it doesnt seem to be some kind of weird quirks mode. This happens on all websites.

What are the possible reasons for that to happen?

[PhistucK]

document.scrollingElement === document.documentElement is actually the standards compliant behavior, not the quirks mode behavior. So this is actually the correct behavior for CSS1Compat compatMode, per the specification. See https://dev.opera.com/articles/fixing-the-scrolltop-bug/.

But - Chrome has not enabled it by default yet (:(), however, if you enabled the experimental web platform features (chrome://flags/#enable-experimental-web-platform-features), it will be enabled.

If that flag is not enabled in your Chrome, I suspect it might be a finch experiment (a feature that is only enabled for some percentage of the users). Restarting Chrome completely might opt you out of the experiment, I think.

☆PhistucK

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