JavaScript: An Overview

Capabilities of JavaScript

JavaScript is a fundamental programming language for web development. It is utilized to perform calculations, manipulate data, and ensure data validation. Additionally, it can modify and update both HTML and CSS elements.

Modifying HTML Content with JavaScript

JavaScript provides various methods to alter HTML content. One such method is getElementById(). Consider the following example where an HTML element with the id "demo" is selected and its content is changed to "Hello JavaScript":

JavaScript supports the use of both double and single quotes in its syntax.

Altering HTML Attribute Values with JavaScript

JavaScript can also modify attribute values within HTML tags. For instance, it can change the src attribute of an <img> tag.

Changing HTML Styles (CSS) Using JavaScript

Apart from attributes, JavaScript can adjust the styling of HTML elements, effectively altering their CSS.

Hiding HTML Elements with JavaScript

JavaScript allows for the hiding of HTML elements by modifying the display style.

Revealing Hidden HTML Elements with JavaScript

Similarly, JavaScript can reveal hidden elements by adjusting the display style.

Additional Insights

JavaScript is distinct from Java, both conceptually and in design. Created by Brendan Eich in 1995, JavaScript became an ECMA standard by 1997. The official standard is referred to as ECMA-262, while the language is officially named ECMAScript.