How Are The `colspan` And `rowspan` Attributes Different? | CSS-Tricks
Briefly

Functionally, the difference between colspan and rowspan attributes in HTML standards reveal an interesting quirk: colspan maxes out at 1000, while rowspan extends to 65534, despite the potential for confusion.
The HTML standard outlines the parsing rules for colspan and rowspan values. It establishes that if parsing fails or the attribute is absent, the defaults are 1 for both attributes, with specific thresholds for caps.
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