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Small, practical examples. Search by task or narrow things down below.

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JavaScriptRegular expressions & URL encoding

Resolve a relative URL against a base

JavaScript: A trailing slash makes the final base path component a directory.

JavaScript✓ Tested
TypeScriptRegular expressions & URL encoding

Resolve a relative URL against a base

TypeScript: A trailing slash makes the final base path component a directory.

TypeScript✓ Tested
HTMLMetadata & document links

Resolve relative links against an explicit base

HTML: A base href changes how relative document URLs are resolved.

HTML✓ Tested
CSSInteraction & themes

Respect dark color preference

Apply different CSS colors when the browser requests a dark theme.

CSS✓ Tested
CSSInteraction & themes

Respect reduced motion

Disable a CSS animation when the user prefers reduced motion.

CSS✓ Tested
jQueryGetting Started

Respond to a button click

jQuery: Learn how to respond to a button click in a complete browser example.

jQuery✓ Tested
jQueryEvent control

Respond to the Enter key

jQuery: Use the event key rather than deprecated numeric key codes.

jQuery✓ Tested
jQueryGetting Started

Respond when a select value changes

jQuery: Learn how to respond when a select value changes in a complete browser example.

jQuery✓ Tested
jQueryGetting Started

Respond while a user types

jQuery: Learn how to respond while a user types in a complete browser example.

jQuery✓ Tested
HTMLTables & list numbering

Restart numbering at an individual list item

HTML: A value on one ordered-list item sets its ordinal and affects following items.

HTML✓ Tested
jQueryForm serialization & state

Restore a form’s original default values

jQuery: Call the native reset method through the underlying form element.

jQuery✓ Tested
PowerShellCommands & execution context

Restore an environment value after temporary use

PowerShell: Use finally so temporary process configuration does not leak to subsequent work; remove the entry when it was originally absent.

PowerShell✓ Tested