fix(dialog): should extend HTMLElement

[mgr34]

successful merge closes #696

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I signed it

[codecov-io]

Codecov Report

Merging #723 into rc0.11.0 will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           rc0.11.0     #723   +/-   ##
=========================================
  Coverage     95.18%   95.18%           
=========================================
  Files            73       73           
  Lines          2905     2905           
  Branches        441      441           
=========================================
  Hits           2765     2765           
  Misses           45       45           
  Partials         95       95

Impacted Files	Coverage Δ
packages/dialog/DialogTitle.tsx	100% <ø> (ø)	⬆️
packages/dialog/DialogFooter.tsx	100% <ø> (ø)	⬆️
packages/dialog/DialogContent.tsx	100% <ø> (ø)	⬆️
packages/dialog/index.tsx	99.29% <100%> (ø)	⬆️

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[moog16]

Thanks for following up! LGTM