Chrome 142 interest invokers support

[chrisdavidmills]

Summary

Chrome 142 adds support for the interest invokers feature. This provides a declarative way to signal interest in an element (for example, by hovering, focusing, or long-pressing it) and have a popover open as a result of that interest.

This feature includes the following subfeatures:

• The interestfor attribute, available on the HTML <a>, <button>, and <area> elements, and the SVG <a> element.
• The InterestInvokerElement property, available on the HTML <a>, <button>, and <area> elements, and the SVG <a> element.
• The interest and loseinterest events, available on the HTML <a>, <button>, and <area> elements, and the SVG <a> element.
• The InterestEvent event object.
• The CSS interest-delay, interest-delay-start, and interest-delay-end properties.
• The CSS :interest-source and :interest-target pseudo-classes.

The CSS features are already specified and in BCD. The HTML and DOM features are not yet specified (see whatwg/html#11006); this PR adds them to BCD, marked as "standard_track": false for now, until the PR gets merged.

Test results and supporting details

Related issues

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