4.24. Introduction to HTML: basic structure, tags and attributes: Variables and data types
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Introduction to HTML
HTML, or Hyper Text Markup Language, is the standard markup language for creating web pages and applications. Combined with technologies such as CSS (Cascading Style Sheets) and JavaScript, HTML forms the essential triad of web technologies.
Basic Structure
A basic HTML document has a specific structure that includes the following parts:
- Doctype: The type of document. For HTML5, this is <!DOCTYPE html>.
- HTML Element: The root element of the HTML document, <html>.
- Head: The <head> contains metadata (data about data) that is not displayed on the web page.
- Body: The <body> contains web page content such as text, images, videos, etc.
Tags and Attributes
HTML tags are the foundation of any web page. They define the structure and layout of the site and can range from simple text tags such as <p> for paragraphs and <h1> for headers, to more complex tags for embedding images, videos and scripts.
Each HTML tag can have attributes. Attributes provide additional information about the element and usually come in name/value pairs. For example, the "src" attribute for the image tag <img> specifies the image source.
Variables and Data Types
Variables in HTML are a little different from variables in programming languages. In HTML, variables are actually called "attributes". They are used to provide additional information about an HTML element. Attributes always come in name and value pairs.
There are several data types you can use in HTML. Some of the most common include:
- Text: This is the most common data type. It is used to insert text into a web page.
- Numbers: Used to insert numbers into a web page.
- URLs: Used to insert links into a web page.
- Booleans: Used to insert true/false values into a web page.
In summary, understanding the basic structure of HTML, tags, attributes and data types is essential for any front-end developer. It's the foundation on which you'll build your CSS and JavaScript skills.
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294.25. Introduction to HTML: basic structure, tags and attributes: JavaScript Operators
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