Add formxxx attributes (for <input type="submit"> element)

[slegrand45]

Hello,

A small patch to add the following attributes:

• formaction
• formenctype
• formmethod
• formnovalidate
• formtarget

These attributes are useful in <input type="submit"> element: MDN documentation

[markuswustenberg]

Thanks! 😊

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (033f6ac) to head (e90000f).
Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #241   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            9         5    -4     
  Lines          534       544   +10     
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+ Hits           534       544   +10     

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