Inline

Syntax

style tag with CSS as contnet.

Example

<head>
    <style>
    p {
      color: blue;
    }
    </style>
</head>

External

Syntax

A self-closing HTML tag. End with >, or even />.

<link rel="stylesheet" href="MY_URL">

On older websites, you might see type="text/css" added explicitly.

Example

<head>    
    <link rel="stylesheet" href="https://unpkg.com/primevue@2.2.3/resources/primevue.min.css" />
    
    <link rel="stylesheet" href="/assets/css/styles.css" />
</head>
  • assets/css/styles.css 
      p {
    color: blue;
  }

See the link HTML spec - used not just for CSS.