WebIDL

WebIDL is an interface design language created in 2012.

#792on PLDB

12Years Old

17Repos

Web IDL is an interface description language (IDL) format for describing application programming interfaces (APIs) that are intended to be implemented in web browsers.. Read more on Wikipedia...

WebIDL Wikipedia page
There are at least 17 WebIDL repos on GitHub
file extensions for WebIDL include webidl
The Google BigQuery Public Dataset GitHub snapshot shows 117 users using WebIDL in 120 repos on GitHub
Pygments supports syntax highlighting for WebIDL
GitHub supports syntax highlighting for WebIDL
See also: (2 related languages)IDL specification language, ECMAScript

Example from Linguist:

/* -*- Mode: linguist-disable-strategy-modeline-IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * The origin of this IDL file is
 * http://www.w3.org/TR/css3-animations/#animation-events-
 * http://dev.w3.org/csswg/css3-animations/#animation-events-
 *
 * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
 * liability, trademark and document use rules apply.
 */

[Constructor(DOMString type, optional AnimationEventInit eventInitDict)]
interface AnimationEvent : Event {
  readonly attribute DOMString animationName;
  readonly attribute float     elapsedTime;
  readonly attribute DOMString pseudoElement;
};

dictionary AnimationEventInit : EventInit {
  DOMString animationName = "";
  float elapsedTime = 0;
  DOMString pseudoElement = "";
};

Feature	Supported	Token	Example
Comments	✓		/* A comment */
MultiLine Comments	✓	/* */	/* A comment */
Semantic Indentation	X

WebIDL - Interface design language

Language features