width and height bindings

[Rich-Harris]

See #984. Progress is blocked by #1385 so I'll merge that

This turned out well. One wrinkle: it doesn't work with SVG elements (other than <svg> itself) — not sure if there's a clever alternative.

[codecov-io]

Codecov Report

Merging #1386 into master will increase coverage by 0.01%.
The diff coverage is 96%.

@@            Coverage Diff             @@
##           master    #1386      +/-   ##
==========================================
+ Coverage   91.19%   91.21%   +0.01%     
==========================================
  Files         122      122              
  Lines        4465     4484      +19     
  Branches     1377     1384       +7     
==========================================
+ Hits         4072     4090      +18     
  Misses        156      156              
- Partials      237      238       +1

Impacted Files	Coverage Δ
src/utils/patterns.ts	100% <100%> (ø)	⬆️
src/compile/nodes/Element.ts	93.03% <100%> (+0.15%)	⬆️
src/compile/nodes/Binding.ts	96.07% <100%> (+0.07%)	⬆️
src/validate/html/validateElement.ts	85.58% <85.71%> (ø)	⬆️

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[ekhaled]

Do we get an on:resize event for free because of this?

[Rich-Harris]

afraid not! just the bindings