One more thing that helps: inline Event listener is what you create in HTML:
<span onmouseover="functioncall"></span>
Thus span.onmouseover = (evt) => functioncall ...
span.onmouseover = (evt) => functioncall ...
overwrites (or sets!) the HTML declared Event
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One more thing that helps: inline Event listener is what you create in HTML:
<span onmouseover="functioncall"></span>Thus
span.onmouseover = (evt) => functioncall ...overwrites (or sets!) the HTML declared Event