<!DOCTYPE html> // declaration defines that this document is an HTML5 document
<html> // is the root element of an HTML page
<head> // contains meta information about the HTML page
<title>Page Title</title> // specifies a title for the HTML page (which is shown in the browser's title bar or in the page's tab)
</head>
<body> // defines the document's body, and is a container for all the visible contents, such as headings, paragraphs, images, hyperlinks, tables, lists, etc.
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
p {
font-size: 110%;
font-family: garamond, sans-serif;
}
h2 {
color: red;
background: white;
}
.highlight {
color: red;
background: yellow;
font-weight: bold;
}
#test_id {
color: blue;
background: white;
}
https://ko.wikipedia.org/wiki/HTML
https://ko.wikipedia.org/wiki/CSS