html - CSS modifications not apply -


i've created simple web page using html , code shows below

#header_1 {    background-color: red;  }
<!doctype html>  <html lang="en" xmlns="http://www.w3.org/1999/xhtml">  <head>    <meta charset="utf-8" />    <link href="_css/style.css" rel="stylesheet" />    <title></title>  </head>  <body>    <h1 id="header_1">this html</h1>  </body>  </html>

i've double checked link style.css correct. style not apply @ least once. i've used google chrome browser.

sometimes happens because browser caches css file. reload new version of css file, have hard refresh browser. that, press ctrl + f5.


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