revision:
The <var> tag is used to define a variable in programming or in a mathematical expression. The content inside is typically displayed in italic. This tag is not deprecated. However, it is possible to achieve richer effect by using CSS.
example
The area of a triangle is: 1/2 x b x h, where b is the base, and h is the vertical height.
Codes:
<p class="spec">The area of a triangle is: 1/2 x <var>b</var> x <var>h</var>, where <
var>b</var> is the base, and <var>h</var> is the vertical height.</p>
example
The equation for any straight line can be expressed in the formula: y = mx + b.
Codes:
<p class="spec">The equation for any straight line can be expressed in the formula: <
var>y</var> = <var>mx</var> + <var>b</var>s.</p>
The <video> tag is used to embed video content in a document, such as a movie clip or other video streams. The <video> tag contains one or more <source> tags with different video sources. The browser will choose the first source it supports.
The text between the "video" and "/video" tags will only be displayed in browsers that do not support the "video" element. There are three supported video formats in HTML: MP4, WebM, and OGG.
autoplay ; value: autoplay; specifies that the video will start playing as soon as it is ready.
controls ; value: controls; specifies that video controls should be displayed (such as a play/pause button etc).
height ; value: pixels; sets the height of the video player.
loop ; value:loop; specifies that the video will start over again, every time it is finished.
muted ; value: muted; specifies that the audio output of the video should be muted.
poster ; value: URL; specifies an image to be shown while the video is downloading, or until the user hits the play button.
preload ; value: auto, metadata, none; specifies if and how the author thinks the video should be loaded when the page loads.
src ; value: URL; specifies the URL of the video file.
width ; value: pixels: sets the width of the video player.
example
Codes:
<video style="margin-left:4vw;" width="320" height="240" controls>
<source src="../../pics/Wuzhen-20-10_02.mp4" type="video/mp4">
<source src="../../pics/Wuzhen-20-10_02.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
example
Codes:
<video style="margin-left:4vw;" width="320" height="240" controls autoplay loop>
<source src="../../pics/Wuzhen-20-10_02.mp4" type="video/mp4"/>
</video>