FF141 adds HTML popover source + force option

[hamishwillee]

FF141 supports the source option to HTMLElement.showPopover() and HTMLElement.togglePopover(), and the force option to HTMLElement.togglePopover() in https://bugzilla.mozilla.org/show_bug.cgi?id=1936411

This adds the features.

Related docs work can be tracked in mdn/content#40027

[github-actions]

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

[hamishwillee]

Note, I can't find evidence that they are supported in chrome or Safari, but nor can I find evidence they aren't

[caugner]

Chrome supports

• the force option since 130: https://github.com/caugner/chromium-releases/blame/v130/third_party/blink/renderer/core/html/html_element.cc#L1409
• the force parameter since 116: https://github.com/caugner/chromium-releases/blame/v116/third_party/blink/renderer/core/html/html_element.cc#L1411C19-L1411C32

WebKit supports

• the force option since Safari 18.4 (WebKit/WebKit@899ca0c landed in 621.1.9 before Safari 18.4/WebKit 621.1.15),
• the force parameter since the beginning, i.e. Safari 17 (see https://github.com/WebKit/WebKit/blame/ecb76a449ffa26cb4da089afe4ee8d7ba90f13a9/Source/WebCore/html/HTMLElement.h#L155).

[hamishwillee]

I copied the pattern of source.
For both this and source shouldn't the actual pattern be as below, based on the schema? Or did that change?

Suggested change

	"force": {
	"option_force": {

[caugner]

Given that force can be both a parameter and an option, and the option came later, we might want to record it as both force_parameter and force_option, to avoid confusion.

[hamishwillee]

Yes. That is absolutely the right thing to do. I have changed this to match the expected schema and key names.

PS Thanks for doing the research on when these were introduced in chrome/safari

[caugner]

Given that force can be both a parameter and an option, and the option came later, we might want to record it as both force_parameter and force_option, to avoid confusion.

[caugner]

Chrome supports

• the force option since 130: https://github.com/caugner/chromium-releases/blame/v130/third_party/blink/renderer/core/html/html_element.cc#L1409
• the force parameter since 116: https://github.com/caugner/chromium-releases/blame/v116/third_party/blink/renderer/core/html/html_element.cc#L1411C19-L1411C32

WebKit supports

• the force option since Safari 18.4 (WebKit/WebKit@899ca0c landed in 621.1.9 before Safari 18.4/WebKit 621.1.15),
• the force parameter since the beginning, i.e. Safari 17 (see https://github.com/WebKit/WebKit/blame/ecb76a449ffa26cb4da089afe4ee8d7ba90f13a9/Source/WebCore/html/HTMLElement.h#L155).