html font size

CSS

<span style="font-size:20px;"></span>font-size: 25px;font-size:20px;

"default size is : +-16px;"<body>      
         <h1 style="color:red;font-size:40px;">Heading</h1>      
         <p style="color:blue;font-size:18px;">This is demo text</p>    
      </body>

Source

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