Internet Demo page (more)

View Source.

iframe for images

Satellite view of Howth.
From Google Maps.
See menu - "Share or embed map".
This is a single URL embedded with <iframe>.
Drag to move. Scroll may be trapped by page or trapped by iframe.
Uses Ajax technology to update page.
Google Maps was one of the defining applications popularising the Ajax idea.

Google Street View along the cliff path in Howth.
From Google Maps.
See menu - "Share or embed image".
Apparently captured with backpack camera.

iframe for video

Titanic in Almost 5 Seconds (Remastered).
YouTube breakthrough was providing "embed code". Put big load on their servers. But made YouTube a success.
YouTube enabled an entire universe of memes and parodies and mash-ups and home-made work that did not exist before.

Download the video:
The actual video file is online at a normal URL while you are playing this.
View source.
Then itag value shows the formats available.
Can you see the URLs of the videos?

Find URLs:
To see all URLs that are being accessed by a page can be difficult. They are often hidden in calls made by JavaScript.

Chrome - DevTools - Network - Reload
URL-sniffing programs like URL Snooper and URL Helper.

iframe for JavaScript graphics

Demo of 3d model on page made using JavaScript graphics.
JavaScript graphics can draw arbitrary graphics on the <canvas> element.
Drag to rotate.
Scroll to zoom. (Note that scroll is trapped by the iframe not by the page.)
Click to throw paint.
Click to run World: webgl decals at Ancient Brain.