How it works
To add a lightbox item, make sure you have a link with a working image or video url inside the "href" attribute and the .lightbox class added. Like this:
<a href="image/path/image.jpg" class="lightbox"> // Your thumbnail image </a>
For any existing lightbox image on a page, the Lightbox script will automatically generate a lightbox gallery which is infinite.
You can also add MP4, YouTube and Vimeo embed links.
Note: this is not the url of the YouTube video page or Vimeo video page, but looks like this:
For YouTube us the video ID from the video URL, like this: https://www.youtube.com/embed/<VIDEO_ID>
For Vimeo us the video ID from the video URL, like this: //player.vimeo.com/video/<VIDEO_ID>
You can see examples of the embed links inside the index.html. No need to add additional classes (other than .lightbox). The lightbox script will automatically see if it's a Vimeo or YouTube link and will act like one.
For Mp4 videos, just link to the mp4 video inside the href and it will automatically recognize that it's an mp4.