element, which adds native video playback support to the HTML specification in HTML5, can be used to embed a video in an HTML document. As long as you’re using a what-you-see-is-what-you-get (WYSIWYG) editor like WordPress’ Gutenberg, pasting the video URL directly into the text will create the embedded video. In your browser, go to the YouTube video that you want to embed. Clients that will display and play video will use the poster attribute as the cover image for the video and the file referenced by the source tag as the video. Select the width you wish or leave it on auto for a Vimeo responsive embed. It is the basic method to embed MP4 video into HTML.