<script> tags changes and locks font size - html, css, javascript -

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when put script in html file, font changes default , no styling can applied:

<!doctype html> <html> <head>     <meta charset="utf-8">     <link rel="stylesheet" href="test.css" type="text/css" />     <meta name="viewport" content="width=device-width, initial-scale=1.0"> </head> <body>  <ul class="topnav">   <li><a href="#home">home</a></li>   <li><a href="#news">news</a></li>   <li><a href="#contact">contact</a></li>   <li><a href="#about">about</a></li> </ul> <script>     function myfunction() {      } </script> </body> </html>

css file looks this:

ul.topnav li {     font-size: 20;       }

if take out script font size changes 20.

why happen?

you don't set 'px'.

change to:

ul.topnav li {     font-size: 20px;       }

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