how to increase the font size in 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: make text bigger html5

p {
  font-size: 15px;
}

p {
  font-size: large;
}

p {
  font-size: 150%;
}

Example 3: html font size

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

Example 4: html font size

font-size:20px;

"default size is : +-16px;"

Example 5: html font size

<h1 style="font-size:10vw">Hello World</h1>

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Css Example