Gives the content of an iframe as a src context to embed (e.g. <iframe seamless srcdoc="<b>Hello World</b>"></iframe>).
Philipp Junghannß (My1) commented
what is this joke? under consideration for over a year now although EVERYTHING (except opera mini, according to caniuse) supports this by now.
yes there is: you can use the sandbox attribute to sandbox the content (something which cannot be done with web components afaik).
Is there an advantage of this over web components? If not, I believe web components should be done first.