Explicit width and height

Thanks for using the plugin. If you are using the thumbnail from the video provider (e.g. the thumbnail uploaded via Youtube) then no height and width is present. This is because getting this information is not easy, expensive in terms of querying or not possible depending on the setup of the website in question.

For these reasons we choose to leave off the height and width.

However, if having these attributes on the thumbnail is super important to you, you can upload your own thumbnail on the block itself. Height and width does get output for custom thumbnails.