programming note 1

add a hyperlink:
BUY A CAR!
a stands for anchor
href stands for hypertext reference
src stands for source
add an image:
<img src=“https://www.tesla.cn/tesla_theme/assets/img/models/section-hero-background.jpg?20160713”/>
nesting:
<imgsrc="https://www.tesla.cn/tesla_theme/assets/img/models/section-hero-background.jpg?20160713"/>
ol stands for ordered list
ul stands for unordered list
li stands for list item
<ol>
<li></li>
<ul>
<li><li>
<ul>
</ol>
<!-- comment -->
<p style="color:red; font-size: 10px; font-family: Arial; background-color:yellow; text-align: center"> </p>
color: https://www.w3.org/TR/css3-color/#svg-color
font family: https://www.w3.org/TR/CSS21/fonts.html#generic-font-families
<strong></strong>
<em></em>