The <iframe> element always fires a load event, protecting from the parent the information whether the child document loaded correctly.

[t10-13rocket]

The <iframe> element always fires a load event, protecting from the parent the information whether the child document loaded correctly.

However, the <object> element fires either load or error, depending on whether the child document loaded correctly. Should that behave like <iframe> instead, so that the information does not leak?

On top of that, <object> supports fallback rendering of its inlined content in case embedding the object data failed. That can also leak the same information.

Originally posted by @antosart in whatwg/html#7327