This repository contains a curated list of technical Web specifications. The list is used in a variety of ways, which include:
- Reffy, which generates Webref, which is then used by tools such as ReSpec and Bikeshed to create terminology and reference links between Web specifications.
- Analyzers of browser technologies to create reports on test coverage, WebIDL, and specification quality.
The repository is called browser-specs because browsers were
historically the focus of the list; it is now open to any spec that can
reasonably be qualified as a "Web specification".
- Spec object
- Spec identifiers
- How to add/update/delete a spec
- Versioning
- Spec selection criteria
- Development notes
The whole list is distributed as an NPM package called web-specs. To incorporate it to your project, run:
npm install web-specsYou can then retrieve the list from your Node.js program:
const specs = require("web-specs");
console.log(JSON.stringify(specs, null, 2));Alternatively, you can fetch index.json
or retrieve the list from the web-specs@latest branch.
The subset of specs that target web browsers is published in a separate browser-specs package. You may retrieve that filtered list from the browser-specs@latest branch
Each specification in the list comes with the following properties:
{
"url": "https://www.w3.org/TR/css-color-4/",
"seriesComposition": "full",
"shortname": "css-color-4",
"series": {
"shortname": "css-color",
"currentSpecification": "css-color-4",
"title": "CSS Color",
"shortTitle": "CSS Color",
"releaseUrl": "https://www.w3.org/TR/css-color/",
"nightlyUrl": "https://drafts.csswg.org/css-color/"
},
"seriesVersion": "4",
"seriesNext": "css-color-5",
"organization": "W3C",
"groups": [
{
"name": "Cascading Style Sheets (CSS) Working Group",
"url": "https://www.w3.org/Style/CSS/"
}
],
"release": {
"url": "https://www.w3.org/TR/css-color-4/",
"filename": "Overview.html"
},
"nightly": {
"url": "https://drafts.csswg.org/css-color/",
"repository": "https://github.com/w3c/csswg-drafts",
"sourcePath": "css-color-4/Overview.bs",
"filename": "Overview.html"
},
"title": "CSS Color Module Level 4",
"source": "w3c",
"shortTitle": "CSS Color 4",
"categories": ["browser"],
"tests": {
"repository": "https://github.com/web-platform-tests/wpt",
"testPaths": [
"css/css-color"
]
}
}The versioned (but not dated) URL for the spec. For W3C specs published as TR documents, this is the TR URL. For WHATWG specs, this is the URL of the living standard. For specs developed by an organization that does not provide a public version of the spec such as ISO, this is the URL of the page that describes the spec on the organization's web site. In other cases, this is the URL of the latest Editor's Draft.
The URL should be relatively stable but may still change over time. See Spec identifiers for details.
The url property is always set.
A shortname that uniquely identifies the spec in the list. The value matches the
"well-known" shortname of the spec, that usually appears in the versioned URL.
For instance, for W3C specs published as TR documents, this is the TR shortname.
For WHATWG specs, this is the shortname that appears at the beginning of the URL
(e.g. compat for https://compat.spec.whatwg.org/). For specs developed on
GitHub, this is usually the name of repository that holds the spec.
When the spec is a fork (see forkOf) of a base spec, its shortname
will start with the shortname of the base spec completed by -fork- and the
actual shortname of the fork spec. For instance, given an exception handling
fork of the WebAssembly spec for which the raw shortname would be
exception-handling, the actual spec shortname will be
wasm-js-api-1-fork-exception-handling.
The shortname should be relatively stable but may still change over time. See Spec identifiers for details.
The shortname property is always set.
The title of the spec. The title is either retrieved from the
W3C API for W3C specs,
Specref or from the spec itself. The
source property details the actual provenance.
The title property is always set.
The short title of the spec. In most cases, the short title is generated from
title by dropping terms such as "Module", "Level", or "Standard". In some
cases, the short title is set manually.
The shortTitle property is always set. When there is no meaningful short
title, the property is set to the actual (possibly long) title of the spec.
An array that contains the list of categories that the spec belongs to. The only
possible value so far is "browser", which means that the spec targets web
browsers.
The categories property is always set. Value may be an empty array for some of
the specs in the web-specs package. Value always contains "browser" for
specs in the browser-specs package.
A rough approximation of whether the spec is in good standing, meaning that, regardless of its current status, it should be regarded as a spec that gets some love from targeted implementers and as a spec that has some well-defined scope, whether the spec has not yet matured enough or should only be viewed as a collection of interesting ideas for now, or whether development of the spec has been discontinued.
Specs for which the status is "Unofficial Proposal Draft" or "A Collection of
Interesting Ideas" typically have a standing set to "pending" (but there may
be exceptions).
Specs whose status is "Discontinued Draft" typically have a standing set to
"discontinued".
The standing property is always set. Value may either be "good", "pending"
or "discontinued". Value is always "good" for specs in the browser-specs
package.
An array that contains the list of shortnames of specs that replace or otherwise obsolete the contents of a discontinued spec.
The obsoletedBy property is only set when standing is "discontinued",
provided that there are indeed specs that replace the contents of the spec.
An array that contains the list of shortnames that were used to identify the spec in the past. The property is not meant to provide an exhaustive list of all the shortnames that a spec ever had, but just a list of the shortnames that the spec used to have in browser-specs.
By definition, shortnames listed in formerNames properties are not current
shortnames. They can be used in projects that consume the list of specs to track
a specification over time.
The formerNames property is only set for specs that used to be known under a
different shortname in browser-specs.
An object that describes the series that the spec is part of. A series includes existing levels/versions of the spec. For instance, CSS Color Module Level 4 belongs to the same series as CSS Color Module Level 3 and CSS Color Module Level 5.
Please note that the list only contains specs that are deemed to be of interest. In particular, the list does not contain levels and versions that have been fully superseded, and may not contain early drafts of new levels and versions either.
The series property is always set.
A shortname that uniquely identifies the series. In most cases, the shortname
is the shortname of the spec without the level or version number. For instance,
the series' shortname for css-color-5 is css-color. When a specification is
not versioned, the series' shortname is identical to the spec's shortname.
The shortname property is always set.
The shortname of the spec that should be regarded as the current level or
version in the series. The current spec in a series is up to the group who
develops the series. In most cases, the current spec is the latest level or
version in the series that is a "full" spec (see
seriesComposition).
The currentSpecification property is always set.
The version-less version of the title of the spec which can be used to refer to
all specs in the series. The title is either retrieved from the
W3C API for W3C specs, or derived from the
spec's title.
The title property is always set.
The short title of the series title. In most cases, the short title is generated
from series.title by dropping terms such as "Module", "Level",
or "Standard". In some cases, the short title is set manually.
The shortTitle property is always set. When there is no meaningful short
title, the property is set to the actual (possibly long) series title.
The URL of the latest published snapshot for the spec series. For leveled specs
(those that create a series), this matches the unversioned URL. In most cases,
that unversioned URL will return the specification identified by the
currentSpecification property. It may return
an earlier level though, e.g. when the current specification has not yet been
published as a TR document.
For instance, this property will be set to https://www.w3.org/TR/css-fonts/
for all specifications in the CSS Fonts series.
For non-leveled specs, this matches the url property.
The releaseUrl property is only set for W3C specs published as TR documents.
For leveled specs (those that create a series), this matches the unversioned URL
that allows to access the latest Editor's Draft of the current specification in
the series. That unversioned URL should return the specification identified by
the currentSpecification property.
For instance, this property will be set to https://drafts.csswg.org/css-fonts/
for all specifications in the CSS Fonts series.
For specs that are not part of a series of specs, this matches the
nightly.url property.
The nightlyUrl property is always set when the nightly property
is set.
The level or version of the spec, represented as an x, x.y or x.y.z string
with x, y and z numbers, and x always greater than or equal to 1. For
instance, this property will have the value 1.2 (as a string, so enclosed
in ") for the WAI-ARIA 1.2 spec.
The seriesVersion property is only set for specs that have a level or version
number.
Whether the spec is a standalone spec, whether it is a delta spec over the
previous level or version in the series, or whether it is a temporary fork of
another spec. Possible values are full, delta, or fork.
The seriesComposition property is always set.
The shortname of the previous spec in the series.
The seriesPrevious property is only set where there is a previous level or
version.
The shortname of the next spec in the series.
The seriesNext property is only set where there is a next level or version.
The shortname of the spec that this spec is a fork of.
The forkOf property is only set when the spec is a fork of another one. The
seriesComposition property is always "fork" when the
forkOf property is set.
A forked specs is supposed to be temporary by nature. It will be removed from the list as soon as it gets merged into the main spec, or as soon as it gets abandoned.
An array that lists shortnames of known forks of the spec in the list.
The forks property is only set when there exists at least one fork of the
spec in the list, in other words when there is an entry in the list that has a
forkOf property set to the spec's shortname.
The name of the standardization organization that owns the spec such as W3C,
WHATWG, IETF, Ecma International, Khronos Group.
The organization property is always set.
The list the groups that develop (or developed) the spec. Each item in the array
is an object with a name property that contains the human-readable name of the
group and a url property that targets the homepage of the group.
The groups property is always set. In most cases, a spec is developed by one
and only one group.
An object that represents the latest published snapshot of the spec, when it exists.
The release property is only set for W3C specs published as TR documents.
The URL of the latest published snapshot of the spec. Matches the versioned
URL (see url).
The url property is always set.
The status of the latest published snapshot of the spec. See Documents published at W3C for possible values, e.g. "Recommendation", "Candidate Recommendation Draft", "Draft Registry" or "Working Draft".
The status property is always set.
The filename of the resource that gets served when the default URL is fetched.
For instance, the filename for https://www.w3.org/TR/presentation-api/ is
Overview.html, meaning that the specification could also be retrieved from
https://www.w3.org/TR/presentation-api/Overview.html. The filename may be
useful to distinguish links to self in a spec.
The filename property is always set.
The list of absolute page URLs when the spec is a multipage spec.
The pages property is only set for specs identified as multipage specs.
An object that represents the latest Editor's Draft of the spec, or the living standard when the concept of Editor's Draft does not exist.
The nightly property is always set unless the spec does not have a public
version available through a URL. For instance, ISO specs are not publicly
available.
The URL of the latest Editor's Draft or of the living standard.
The URL is either retrieved from the W3C API
for W3C specs, or Specref. The document at the
versioned URL is considered to be the latest Editor's Draft if the spec does
neither exist in the W3C API nor in Specref. The source property
details the actual provenance.
The URL should be relatively stable but may still change over time. See Spec identifiers for details.
The url property is always set.
The status of the nightly version of the spec. This is typically "Editor's Draft" or "Living Standard", but can also be "Draft Community Group Report" for Community Group drafts, "Unofficial Proposal Draft" for some unofficial CSS specifications, "Internet Standard" for IETF specifications, etc.
The status property is always set.
A list of alternate URLs for the Editor's Draft or the living standard.
The list typically contains URLs that external sources may use to reference the spec, be it because the canonical URL evolved over time and sources still use old URLs (e.g. when the spec was incubated in a Community Group and transitioned to a Working Group), or because the canonical URL is unstable for some reason and external sources decided to use a workaround (e.g. CSS drafts).
Alternate URLs should only be used to ease mapping between external sources and
specs in browser-specs. The canonical URL in nightly.url
should be preferred to reference a spec otherwise.
Alternate URLs are only set when needed, in other words when an alternate URL is effectively in use in some external source and when the external source cannot easily be updated to use the canonical URL. In particular, the list is not meant to be exhaustive.
The alternateUrls property is always set and is often an empty array.
The filename of the resource that gets served when the default URL is fetched.
For instance, the filename for https://w3c.github.io/presentation-api/ is
index.html, meaning that the specification could also be retrieved from
https://w3c.github.io/presentation-api/index.html. The filename may be
useful to distinguish links to self in a spec.
The filename property is always set.
The list of absolute page URLs when the spec is a multipage spec.
The pages property is only set for specs identified as multipage specs.
The URL of the repository that contains the source of the Editor's Draft or of the living standard.
The URL is either retrieved from the Specref or
computed from nightly.url.
The repository property is always set except for IETF specs where such a repo does not always exist.
The relative path to the filename that contains the source of the Editor's Draft or of the living standard at the HEAD of the default branch of the repository.
That path is computed by parsing the contents of the repository for common
patterns. The info must be specified in specs.json for specifications that do
not follow a common pattern.
The sourcePath property is always set when repository is set... except in
rare cases where the source of the spec is not in the default branch of the
repository.
Note: The path is relative to the root of the repository, and only valid in
the default branch of the repository. If needed, the source may be fetched from
the absolute HTTPS URL ${nightly.repository}/blob/HEAD/${nightly.sourcePath}.
An object that links the specification with its test suite when it has one.
The URL of the repository that contains the test suite of the specification,
typically https://github.com/web-platform-tests/wpt.
The repository property is always set when the tests object is present.
The list of relative paths to the actual tests at the HEAD of the default branch of the test repository.
For test suites within Web Platform
Tests, the list is determined by
looking at META.yml files within each folder.
The testPaths array typically only contains one entry, but tests of a given
spec are sometimes spread over multiple folders. For instance, that is the case
for DOM and HTML tests.
The testPaths property is usually set when the tests object is present. When
absent, that means that the entire repository is the test suite.
The list of relative sub-paths of paths listed in the testPaths property that
do not contain tests for the underlying spec. For instance, tests for the
WebXR Device API are under the
webxr folder,
but several folders under webxr actually contain test suites for WebXR module
specs and as such need to be excluded from the test suite of the WebXR Device
API spec.
The excludePaths property is seldom set.
The provenance for the title and nightly property values. Can be one of:
w3c: information retrieved from the W3C APIspecref: information retrieved from Specrefietf: information retrieved from the IETF datatrackerspec: information retrieved from the spec itself
The source property is always set.
An entry in browser-specs contains properties that can be viewed as
identifiers: shortname, url, and
nightly.url. Please note that these identifiers are not fully
stable.
The shortname property should remain mostly stable over time. The shortname
may still change though, for instance when a W3C specification starts being
published as a TR document with a shortname that is different from the one used
during incubation, or when an IETF specification gets published as an RFC.
Starting in July 2023, when the shortname of a specification changes in
browser-specs, the previous shortname gets added to a
formerNames property. This makes it possible to track a
specification entry over time in browser-specs.
The url property contains a URL of the specification that can be regarded as
canonical and mostly stable too, but that URL will typically change when a
specification starts getting published as a formal technical document, or when
a specification transitions from one organization or group to another one.
The nightly.url property is the least stable identifier of a specification.
That URL may be under the control of an individual or group, who may decide to
change the URL at any time. Or it may be affected by a change of status. For
instance, the nightly.url property will change when a W3C spec incubated in
the Web Platform Incubator Community Group (WICG) transitions to a Working
Group, or when a new version of an IETF draft gets published.
If your project tracks specifications over time and relies on browser-specs to
gather information about these specifications, you will need to record the
shortname of the specifications you're tracking, and apply the following
algorithm to find the relevant specification entry in browser-specs:
- Look for an entry in browser-specs whose
shortnamematches the recorded shortname. If one is found, that is the relevant specification entry. - Look for entries in browser-specs that have the recorded shortname in its
formerNamesproperty. If one is found, that is the relevant specification entry. - If you found more than one entry in the previous step, that looks like a bug in browser-specs, please raise an issue.
- If you're still looking for a relevant specification entry at this point whereas the recorded shortname used to exist in browser-specs, that looks like a bug in browser-specs too, please raise an issue.
Shortname changes may occur in major and minor releases of npm packages but not in patch releases.
If you believe that a spec should be added to the list, check the selection criteria below and use the "New spec" issue template.
For other types of changes, please check contributing instructions.
This repository contains a curated list of technical Web specifications that are deemed relevant for the Web platform. Roughly speaking, this list should match the list of web specs actively developed by W3C, the WHATWG and a few other organizations.
To try to make things more concrete, the following criteria are used to assess whether a spec should a priori appear in the list:
- The spec is stable or in development. Superseded and abandoned specs will not appear in the list. For instance, the list contains the HTML LS spec, but not HTML 4.01 or HTML 5).
- The spec is being developed by a well-known standardization or pre-standardization group. Today, this means a W3C Working Group or Community Group, the WHATWG, the IETF, the TC39 group, the Khronos Group, the Alliance for Open Media (AOM), or ISO.
- The spec sits at the application layer or is "close to it". For instance, most IETF specs are likely out of scope, but some that are exposed to Web developers are in scope.
- The spec defines normative content (terms, CSS, IDL), or it contains informative content that other specs often need to refer to (e.g. guidelines from horizontal activities such as accessibility, internationalization, privacy and security).
There are and there will be exceptions to the rule. Besides, some of these criteria remain fuzzy and/or arbitrary, and we expect them to evolve over time, typically driven by needs expressed by projects that may want to use the list.
This project adheres to Semantic Versioning
with the following increment rules given a major.minor.patch version:
major: A property disappeared, its meaning has changed, or some other incompatible API change was made. When themajornumber gets incremented, code that parses the list likely needs to be updated.minor: A new property was added, the list of specs changed (a new spec added, or a spec was removed). Code that parses the list should continue to work undisturbed, but please note that there is no guarantee that a spec that was present in the previous version will continue to appear in the new version. Situations where a spec gets dropped should remain scarce. If you believe that removal of a spec should rather trigger amajorupdate, please raise an issue and explain how it affects your project.patch: Info about one or more specs changed. Minor updates were made to the code that don't affect the list.
To re-generate the index.json file locally, run:
npm run buildImportant: The generation process will try to retrieve information about W3C
specification from the W3C API. For that to work, the code requires the presence
of a config.json file in the root folder with a GH_TOKEN field
set to a valid GitHub Personal Token
(default read permissions are enough).
Generation takes several minutes. See Build a restricted set of specs below for incremental tools.
To check whether a new spec can be added to the list, run:
npx browser-specs build [url]See the command help for details:
npx browser-specs --help
npx browser-specs build --helpThe index.js module can be used as a command-line interface (CLI) to quickly
look at a given spec in the index.json file. The command outputs the spec or
list of specs that match the provided token as a formatted JSON string.
For instance, to retrieve all specs, the Compatibility Standard spec, the CSS Media Queries Module Level 5 spec, all delta specs, and a spec identified by its URL, run:
node index.js
node index.js compat
node index.js mediaqueries-5
node index.js delta
node index.js https://w3c.github.io/presentation-api/Note: The index.js CLI is not part of released packages, which only
contain the actual list of specifications.
To run all tests or to test a given module locally, use one of:
npm test
npm test test/compute-shortnameTests are run automatically on pull requests.
The npx browser-specs build command can be used to build a spec, or a series
of changes made to specs.json, see the command help for details:
npx browser-specs --help
npx browser-specs build --helpThe command will report the changes to index.json that the tested updates would trigger, for instance (output truncated to better show the outline):
{
"added": [
{
"url": "https://dom.spec.whatwg.org/",
"seriesComposition": "full",
"shortname": "dom",
"...": "..."
}
],
"updated": [
{
"url": "https://compat.spec.whatwg.org/",
"seriesComposition": "full",
"shortname": "compat",
"...": "..."
}
],
"deleted": [
{
"url": "https://console.spec.whatwg.org/",
"seriesComposition": "full",
"shortname": "console",
"...": "..."
}
]
}Releases are semi-automated through GitHub workflows. Whenever the list of specs is updated on the main branch, pre-release pull requests are created with the diff to release as description. Merging these pull requests releases the new version of NPM packages.
