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HTML Rendering: Gmail uses Javascript to dynamically create and render the Gmail user interface. This may conflict with certain HTML code and cause display inconsistencies. Standard HTML should come through correctly, whereas more advanced CSS or DHTML may be corrupted.
Potential Action: A good rule of thumb to ensure maximum HTML compatibility across all e-mail clients is to use plain vanilla HTML in messages, and to make sure all HTML follows the HTML 4.01 specifications.
Do the coding experts agree with the HTML/CSS comments in this article?