[css-sizing][responsive-frame] Should `frame-sizing` apply to `<object>` elements?

[kojiishi]

This is a follow up to the discussion on Jan 28.

smfr: this is just about iframe and also object?
chrisl: why would object be different?
iank_: can take it as an issue
fantasai: does svg have different behavior between iframe and object
dbholbert: it does

@smfr @svgeesus @fantasai @dholbert @bfgeek

The current behaviors are as below (simple tests for the SVG sizing):

Content Type	<iframe>	<object>
HTML	Fixed viewport, defaults to 300x150. No auto-resize.
SVG	Fixed viewport, defaults to 300x150. No auto-resize.	Acts as a replaced element; auto-resizes to intrinsic dimensions.

One way to say is to apply to both elements, because they have the same behavior for HTML today.

Another way is to apply only to <iframe>, because it has security sandbox, and it's better suited for HTML.

I don't have a strong opinion, anyone?

[kojiishi]

Re-reading the IRC, @emilio and @Loirooriol also raised about the SVG sizing.