hwo to adjust font size html code example

Example 1: 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>

Example 2: 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>

Example 3: how to increaase font size on html

<font size="+2">This is bigger text.</font>

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