iframe and img tags accepts onload handlers

[V2dha]

added test cases that resolves the Issue 474

[codecov]

Codecov Report

Merging #876 (4c79faa) into main (a962211) will not change coverage.
The diff coverage is n/a.

❗ Current head 4c79faa differs from pull request most recent head 0d2bc43. Consider uploading reports for the commit 0d2bc43 to get more accurate results

@@           Coverage Diff           @@
##             main     #876   +/-   ##
=======================================
  Coverage   99.26%   99.26%           
=======================================
  Files          98       98           
  Lines        1488     1488           
  Branches      492      492           
=======================================
  Hits         1477     1477           
  Misses         11       11           

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