📅  最后修改于: 2023-12-03 15:16:38.821000             🧑  作者: Mango
HTML is the standard markup language used to create web pages. It is the foundation of every website and plays a crucial role in defining the structure and content of a web page. HTML stands for HyperText Markup Language and is used in conjunction with other technologies like CSS and JavaScript to create visually appealing and interactive web pages.
HTML is a text-based language and is easy to understand and use. It uses tags and attributes to define the structure and format of a web page. Here are some basic tags that are used in HTML:
<html>
: Defines the root of an HTML document.<head>
: Contains meta information about the document, such as title and links to external stylesheets and scripts.<body>
: Contains the main content of the web page.<h1>
to <h6>
: Defines headings of different sizes.<p>
: Defines a paragraph of text.Here's an example of a basic HTML document:
<!DOCTYPE html>
<html>
<head>
<title>My Web Page</title>
</head>
<body>
<h1>Welcome to my web page</h1>
<p>This is some sample text.</p>
</body>
</html>
Attributes are used to provide additional information about HTML elements. They are specified inside the opening tag of the element and take the form of attribute="value"
. Here are some commonly used attributes:
id
: Specifies a unique identifier for an element.class
: Specifies one or more classes for an element.href
: Specifies the link destination for an anchor tag (<a>
).src
: Specifies the URL of an image or other media element.alt
: Specifies alternative text for an image.Here's an example of how to use attributes in HTML:
<!DOCTYPE html>
<html>
<head>
<title>My Web Page</title>
</head>
<body>
<h1 id="main-heading" class="main-heading">Welcome to my web page</h1>
<p>This is some <a href="https://www.example.com">sample text</a>.</p>
<img src="image.jpg" alt="An image">
</body>
</html>
CSS is used to style HTML elements and make them look visually appealing. It stands for Cascading Style Sheets and provides a way to separate the presentation of a web page from its content. CSS is typically stored in external files or included within the HTML document using the <style>
tag.
Here's an example of using CSS to style an HTML element:
<!DOCTYPE html>
<html>
<head>
<title>My Web Page</title>
<style>
.main-heading {
font-size: 2rem;
color: blue;
}
</style>
</head>
<body>
<h1 class="main-heading">Welcome to my web page</h1>
<p>This is some sample text.</p>
</body>
</html>
HTML is an essential technology for creating websites. With a solid understanding of HTML, web developers can create websites that are optimized for search engines, accessible to all users, and visually appealing.