Update no-unknown-property.js

[DerekStapleton]

They body tag supports an onload event

https://www.w3schools.com/jsref/event_onload.asp

[DerekStapleton]

Another, probably better, source: https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/load_event

[ljharb]

definitely better

[ljharb]

thanks! this will need some test changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.14%. Comparing base (3a03579) to head (d90472d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3923      +/-   ##
==========================================
- Coverage   97.83%   94.14%   -3.70%     
==========================================
  Files         136      133       -3     
  Lines        9997     9985      -12     
  Branches     3715     3715              
==========================================
- Hits         9781     9400     -381     
- Misses        216      585     +369     

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