https://www.caniemail.com/features/html-cellpadding/
Can I email… cellpadding attribute
Supported in Apple Mail, Gmail, Outlook, Yahoo! Mail.
cellpadding attribute
https://www.netlingo.com/word/cellpadding.php
cellpadding - NetLingo The Internet Dictionary: Online Dictionary of Computer and Internet Terms,...
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the internetcellpaddingnetlingodictionaryonline
https://www.caniemail.com/tests/html-cellspacing.html
cellpadding and cellspacing
cellpaddingcellspacing