Iframe Lazy
Use this code to create a youtube and vimeo embed videos lazy that loads on click.
Just change iframe[data-src] and img[src] attributes of the iframe and image with the content you want.
This is a speed optimization technique useful to load the website faster and reach higher pagespeed score.
Video Autoplay Lazy
To have a HTML5 video that loads and autoplay only when entering the viewport. Just use video[preload="none"] and don't put video[autoplay].
This is a speed optimization technique useful to load the website faster and reach higher pagespeed score.
Video Matches
Since HTML5 video doesn't support srcset or media attributes on video sources, you can use this little script to have a different media queries on data-src source nodes.
This is a speed optimization technique useful to load the website faster and reach higher pagespeed score.