Html font size

<span style="font-size:20px;"></span>

How to change font size in html

<body>      
         <h1 style="color:red;font-size:40px;">Heading</h1>      
         <p style="color:blue;font-size:18px;">This is demo text</p>    
      </body>

How to increase font size in html

font-size: 25px;

Html font size

font-size:20px;

"default size is : +-16px;"

Change text width html

<!-- relative font size -->
<font size="+2">This is bigger text.</font>
<font size="-1">This is smaller text.</font>

<!-- absolute font size -->
<font size="1">This is really tiny text.</font>

Source: kb.iu.edu

Default font size of html

- The default is 16px.
- If you create an HTML file with any text in it, open it in Chrome, you can check the computed styles.
- I would be interested to see someone test this on mobile versions.

- Edit:- 
As of 2017-03-20, the stable versions of Chrome, Firefox, Edge, and IE on the desktop as well as Chrome, Firefox, and Opera on mobile all default to the de facto standard of 16px for font-size.

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