DOM (Document Object Model)
Definition
A programming interface for web documents that represents the page structure as a tree of objects, allowing programs to change document structure, style, and content.
The Document Object Model is a tree-structured representation of an HTML or XML document that browsers create when loading a web page. Each element, attribute, and text node becomes an object in the tree, which can be accessed and manipulated through JavaScript.
DOM manipulation is central to interactive web development. JavaScript can add, remove, or modify elements, change styles, respond to events (clicks, keyboard input, scrolling), and update content dynamically. Frameworks like React, Vue, and Angular use virtual DOM abstractions to optimize DOM updates for better performance.
Direct DOM manipulation can be expensive performance-wise because changes may trigger layout recalculations, repaints, and reflows. Best practices include batching DOM updates, using document fragments, leveraging CSS transforms for animations, and minimizing layout thrashing by reading layout properties before writing.
Related Calculators
Related Terms
HTML (HyperText Markup Language)
techThe standard markup language for creating web pages, defining the structure and content of a page using elements represented by tags.
CSS (Cascading Style Sheets)
techA stylesheet language used to describe the visual presentation and layout of HTML documents, controlling colors, fonts, spacing, and responsive design.
API (Application Programming Interface)
techA set of rules and protocols that allows different software applications to communicate with each other and share data or functionality.
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