IE Issue - iFrame on page overlaps Admin Bar - zindex ignored

[garrett-eclipse]

Hello,

I noticed an issue with IE11 iframes ignoring zindex and overlapping the WP Admin Bar, screen;
​http://i.imgur.com/yBhFabF.jpg

In the screen we see an iframe with no z-index or absolute positioning overlapping the admin bar when scrolled down.

More info on this bug in IE;
​http://stackoverflow.com/a/12977151

The solution is to basically inject an empty (about:blank) iframe into the container for the wpadminbar for IE.

Let me know if I can help with clarifying or troubleshooting, etc.
Thanks

[garrett-eclipse]

Screenshot of the issue with iFrame overlapping Admin Bar

[danieltj]

Will check that this issue still exists in 4.8.x and above and see what we can do about this.

[garrett-eclipse]

Thanks @danieltj let me know if there's anything I can do.

[sabernhardt]

This is an IE 11 problem on the front-end, too, though it doesn't happen with all iframes.

I tried three different iframes:

1. The embedded PDF overlapped both the WordPress toolbar and the theme's top navigation menu (any part of Twenty Fourteen's fixed menu, dropdowns in Twenty Twenty-One).
2. A YouTube video embed worked fine (either with YouTube Embed block or with Custom HTML block with YouTube's iframe code).
3. A Vimeo video embed worked fine (with either Vimeo Embed block or Custom HTML block with Vimeo's iframe code).

If this is going to be fixed, it should be done soon.

[sabernhardt]

With the ​decision to drop IE 11 support, this ticket can be closed.