XML, HTML, and CSS

XML (eXtensible Markup Language)

XML is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. It is designed to be self-descriptive and extensible, allowing users to define their own tags and structure.

Example

<node data="4">
    <node data="2">
        <node data="1"></node>
        <node data="3"></node>
    </node>
    <node data="6">
        <node data="5"></node>
        <node data="7"></node>
    </node>
</node>

HTML (HyperText Markup Language)

HTML is the standard markup language for creating web pages and web applications. It defines the structure and content of a web page using a system of tags and attributes.

HTML Element Reference

CSS (Cascading Style Sheets)

CSS is a style sheet language used for describing the presentation of a document written in HTML or XML. It allows web developers to control the layout, appearance, and style of multiple web pages all at once.

It is specified as a key-value pair, where the key is the property and the value is the value of that property.

body {
    background-color: lightblue;
}

Selectors

Selectors are used to select the elements you want to style. There are several types of selectors:

• element-name: Selects all elements with the specified name.
• .class-name: Selects all elements with the specified class name.
• #id-name: Selects the element with the specified id.

CSS Selectors Reference

Connections

• Topic index

Obvious technical and formatting errors repaired.