Skip to main content
Skip to search

HTML: Markup language

HTML reference

Elements
Global attributes
Attributes
See all…

HTML guides

Responsive images
HTML cheatsheet
Date & time formats
See all…

Markup languages

SVG
MathML
XML

CSS: Styling language

CSS reference

Properties
Selectors
At-rules
Values
See all…

CSS guides

Box model
Animations
Flexbox
Colors
See all…

Layout cookbook

Column layouts
Centering an element
Card component
See all…

JavaScript: Scripting language

JS reference

Standard built-in objects
Expressions & operators
Statements & declarations
Functions
See all…

JS guides

Control flow & error handing
Loops and iteration
Working with objects
Using classes
See all…

Web APIs: Programming interfaces

Web API reference

File system API
Fetch API
Geolocation API
HTML DOM API
Push API
Service worker API
See all…

Web API guides

Using the Web animation API
Using the Fetch API
Working with the History API
Using the Web speech API
Using web workers

All web technology

Technologies

Accessibility
HTTP
URI
Web extensions
WebAssembly
WebDriver
See all…

Topics

Media
Performance
Privacy
Security
Progressive web apps

Learn web development

Frontend developer course

Getting started modules
Core modules
MDN Curriculum
Check out the video course from Scrimba, our partner

Learn HTML

Structuring content with HTML module

Learn CSS

CSS styling basics module
CSS layout module

Learn JavaScript

Dynamic scripting with JavaScript module

Discover our tools

Playground
HTTP Observatory

Border-image generator
Border-radius generator
Box-shadow generator
Color format converter
Color mixer
Shape generator

Get to know MDN better

About MDN
Advertise with us

Community
MDN on GitHub

Blog

Web
Web APIs
IDBObjectStore
deleteIndex()

IDBObjectStore: deleteIndex() method

Baseline

Widely available