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style外部标签对domcontentloaded的影响

当外部style标签放到head中,(没有script)

当外部style标签放到head中,不阻塞DOMContentLoaded执行。

html
<!DOCTYPE html>
<html lang="en">
<link>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link href="http://localhost:3000/aaa" rel="stylesheet"></link>
</head>
<body>
    <div>hhhhh</div>

</body>
</html>

当外部style标签放到body中或body后,(没有script)

当外部style标签放到body中或body后,会阻塞DOMContentLoaded执行。

html
<!DOCTYPE html>
<html lang="en">
<link>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>hhhhh</div>
    <link href="http://localhost:3000/aaa" rel="stylesheet"></link>

</body>
</html>

style标签后面存在script标签,且script标签存在内容

  1. 当script标签没有内容时,不会阻塞DOMContentLoaded触发。
  2. 有内容时,会等待style加载完且构建成cssom后,执行script脚本后才会触发DOMContentLoaded。
html
<!DOCTYPE html>
<html lang="en">
<link>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link href="http://localhost:3000/aaa" rel="stylesheet"></link>
    <script>
        console.log(123)
    </script>
</head>

<body>
    <div>hhhhh</div>
</body>
</html>