Intent to Experiment: Force Load At Top

[Nick Burris]

Contact emails

nbu...@chromium.org, bo...@chromium.org

Summary

The purpose of ForceLoadAtTop is to provide an opt-out for Scroll To Text for privacy sensitive sites, as discussed in WICG/ScrollToTextFragment#80. The ForceLoadAtTop feature allows sites to indicate that they should be loaded at the top of the page, and not perform any scroll on load, including element fragment identifiers, scroll restoration, and Scroll To Text. I have implemented a Document Policy for ForceLoadAtTop, however the Document Policy feature itself has not shipped yet, so this origin trial is intended to bridge the gap and provide an opt-out for scroll to text until the document policy is available. Sites enrolled in this ForceLoadAtTop origin trial will behave as if the ForceLoadAtTop document policy header is present.

Link to “Intent to Prototype” blink-dev discussion

This is essentially an opt-out trial for Scroll To Text: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/zlLSxQ9BA8Y

Goals for experimentation

We expect usage to be pretty low, and won't provide much insight as this is simply an opt-out.

Experimental timeline

M83 - M87

Any risks when the experiment finishes?

Sites that wish to continue using the ForceLoadAtTop feature will have to add the HTTP header: "Document-Policy: force-load-at-top".

Ongoing technical constraints

None.

Will this feature be supported on all five Blink platforms supported by Origin Trials (Windows, Mac, Linux, Chrome OS, and Android)?

Yes.

Link to entry on the feature dashboard

https://www.chromestatus.com/feature/5744681033924608

[Yoav Weiss]

IIUC this will enable sites that are interested in preventing anchor and direct-text scrolls to try out the new semantics that the related Document Policy will provide.

Do you know when the Document Policy is planned to ship? Is there a point in running the OT after it does?

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[Nick Burris]

Hey Yoav,

Indeed we can end this OT when Document Policy ships. They have a tentative plan to ship or do their own origin trial in M84, but there are still some issues being addressed so it's uncertain.

Nick

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[Joe Medley]

Nick,

Do you have a tracking bug for this?

Joe

Joe Medley | Technical Writer, Chrome DevRel | jme...@google.com | 816-678-7195

If an API's not documented it doesn't exist.

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[nbu...@google.com]

Hi Joe,

Here's the tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1047900

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[Yoav Weiss]

LGTM to experiment in M83-84.

If the Document Policy OT will not be in place by the end of M84, let's rediscuss to see if an extension is needed.

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