[teraflop]

Both of the CodePen example links on that page are insidiously broken. The demos appear to work, but they don't actually demonstrate the claimed portal functionality at all:

    // These two containers are siblings in the DOM
    const appContainer = document.getElementById('app-container');
    const modalContainer = document.getElementById('app-container');

Note that both variables refer to the same element.

[danabramov]

Sorry, there was so much to do in the release that some issues crept into the new docs. We'll fix them soon. :-)

[acdlite]

Fixed now! Thanks for the bug report!

[teraflop]

No problem! And on re-reading my comment, I probably shouldn't have used the word "insidiously", it came off a lot more negative than I intended. Thanks for the quick fix.