Iframes 
<iframe src="url" title="description"> </iframe>

An HTML iframe is used to display a web page within a web page.

Content HTML
Audio 
<audio controls>
    <source src="horse.ogg" type="audio/ogg">
    <source src="horse.mp3" type="audio/mpeg">
  Your browser does not support the audio element.
</audio>

Used to add audio.

Content HTML
Iframes - Link/Target 
<iframe src="url" name="iframe_a" title=""> </iframe>

<a href="example.com" target="iframe_a"> Show in iframe </a>

To change an iframe's content using links to different sources. Connected using target and name.

Content HTML
Meter 
<label for="fuel">Fuel level:</label>
<meter id="fuel"
    min="0" max="100"
    low="33" high="66" optimum="80"
    value="50">
    at 50/100
</meter>

Represents either a scalar value within a known range or a fractional value.

Content HTML
Video 
<video controls autoplay muted>
    <source src=”video.file” type=”video/mp4”>
    <source src="movie.ogg" type="video/ogg">
    Your browser does not support video tag.
</video>

Used to add a video.

Content HTML