We just noticed an issue with the CSS class wb-mltmd.youtube found in theme.min.css (v4.0.22). It adds a background image (the white on red play button from Youtube) as background-repeat all over the area providing the transcript underneath a youtube video. I can confirm that the issue occurs in at least both IE10 and Chrome52.
This is the CSS code causing the issue, grabbed from theme.min.css:
I'm not entirely sure why that class it's not behaving as intended, nor what its purpose really was. For now we've stripped this class from our CSS, but I'd love to hear of an alternate solution if this class is actually used for something useful.
We just noticed an issue with the CSS class wb-mltmd.youtube found in theme.min.css (v4.0.22). It adds a background image (the white on red play button from Youtube) as background-repeat all over the area providing the transcript underneath a youtube video. I can confirm that the issue occurs in at least both IE10 and Chrome52.
This is the CSS code causing the issue, grabbed from theme.min.css:
.youtube{background-image:url(data:image/png;base64,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)}
I'm not entirely sure why that class it's not behaving as intended, nor what its purpose really was. For now we've stripped this class from our CSS, but I'd love to hear of an alternate solution if this class is actually used for something useful.