This came up in #4918 but probably deserves its own issue. At the moment only Chrome implements this element and Firefox and Safari do not.

It would be good to find if we expect this to change somehow.

Things that would help here:

• Usage and demand from web developers
• Implementer positions

I think Firefox is somewhat reluctant at the moment, though not opposed to implementing the underlying primitives, but I'll double check on that.

cc @smaug---- @rniwa @tkent-google