DOMRect doesn't work in some browsers

[SymbolicallyMe]

Describe the bug
The function/constructor DOMRect, used in dom.js (line 160), does not work in Chrome 56, IE 11 and Microsoft Edge, but works in FireFox and Safari.

To Reproduce

1. Add the Table block
2. Open the command line
3. Click on an empty table cell (you should get an error in the console for the browsers mentioned above).

Expected behavior
When clicking on an empty table cell within the Table block, and error should not occur.

Possible Solution
Since DOMRect works only in some browsers, a polyfill or mock DOMRect function should be created or used in place of it. TinyMCE provides it's own function to create Rectangles without issue.

import tinymce from 'tinymce';
var rectangle = tinymce.geom.Rect.create( x, y, width, height );

Screenshots

Relate Issues
#6666

[danielbachhuber]

Looks like we've started progress on this, but are currently blocked: #6666 (comment)

[brandonpayton]

I'll take a look at unblocking #6666 next. We submitted a DOMRect polyfill to a polyfill repository we use, but we can create a place to maintain and use them locally until they're successfully contributed to a polyfill library.

[brandonpayton]

We're no longer using the DOMRect constructor in the latest @wordpress/dom package. Let's close for now and revisit if we resume use of new DOMRect().