test: identify browser/jsdom differences

[ph-fritsche]

What:

Identify the differences between Chrome and Jsdom environment.

Why:

Determine if failing tests in Chrome are the result of wrong assumptions in our tests or wrong implementations in our source.

Checklist:

• Ready to be merged

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

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Latest deployment of this branch, based on commit 2463be9:

Sandbox	Source
userEvent-dom	Configuration
userEvent-react	Configuration

[codecov]

Codecov Report

Merging #1091 (2463be9) into main (7a305de) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1091   +/-   ##
=======================================
  Coverage   99.46%   99.47%           
=======================================
  Files          92       92           
  Lines        2070     2085   +15     
  Branches      714      706    -8     
=======================================
+ Hits         2059     2074   +15     
  Misses         11       11           

Impacted Files	Coverage Δ
src/system/keyboard.ts	100.00% <100.00%> (ø)
src/system/pointer/index.ts	100.00% <100.00%> (ø)

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