Update clip-path CSS to handler older browsers

[dpvc]

This PR changes the clip-path specifications to use polygon() rather than xywh() in order to accommodate older browsers that don't implement xywh(), which is not as widely available as seems to be indicated in the listings at MDN (they don't indicate that some shapes aren't supported).

It also changes white-space: wrap to white-space: pre again to handle older browsers.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.72%. Comparing base (afaf1ea) to head (ea468ec).

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #1356     +/-   ##
==========================================
  Coverage    86.72%   86.72%             
==========================================
  Files          337      337             
  Lines        84145    84156     +11     
  Branches      3140     4769   +1629     
==========================================
+ Hits         72971    72982     +11     
  Misses       11174    11174             

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