TYPO3 Core

VideoTagRenderer.php implodes attributes with $dontOmitBlankAttribs = true.

$attributes[] = GeneralUtility::implodeAttributes($options['additionalAttributes'], true, true);

This could create problems like in this use case:

Example:

<f:media ... additionalAttributes="{poster: '{v:media.exists(file: \'fileadmin/test.jpg\', then: \'/fileadmin/test.jpg\')}', no-cookie: 1, relatedVideos: 0, color: 'white', playsinline: '1'}" />

In this case, AFAIK, it's not possible to omit the attribute 'poster' in Fluid. So, if file doesn't exist the attribute will still be present with an empty value but the use case wants that if a poster is not available for the video then the attribute must not be present.

I don't know if there are use cases that needs $dontOmitBlankAttribs = true but I think that it should be false.