Notice: The WebPlatform project has been discontinued when the Stewards partnership agreement ended in September 2015. This site has been frozen, and the assets we have created will remain.

WPD style guide

WebPlatform Docs (WPD) is intended to be a repository of high quality, reliable, and accessible information. For an article to be considered high quality, it should adhere to certain guidelines as posted here. Articles that do not sufficiently adhere to the guidelines should be tagged with the relevant markers, and may be deleted if they are not improved.


The first thing you need to do when adding new content is to decide the URL. Consult the Topic hierarchy page to understand how content is organized and where your new page should live.

Next, go to the New Page page to create your new page using one of the defined content page templates. When creating an article from the New Page page, bear in mind that what you enter in the path text box will be the URL for the new page, and that the URL need not be the visible page title. That is, a page whose URL is “eventsource_basics” can have an internal title of "Streaming updates with server-sent events". So keep URLs short, descriptive, and unique.

A few guidelines:

  • Do not capitalize unless absolutely vital for syntax correctness. Thus, for an article about user media, you might enter "usermedia"; for an article specifically about the getUserMedia method, you might instead enter "getUserMedia".
  • Use blanks, not underscores, to separate words, as underscores are generated when the page is created. Thus for an article about the HTML5 audio tag, you might enter "audio tag"; the generated URL would be "audio_tag".
  • Do not use other punctuation, such as dashes or parentheses, in a URL. Really, don’t.
  • Do not use articles (the, a, an) in URLs unless absolutely necessary.

Article titles

In the “Custom page title” form field, enter a descriptive title if it is different from the URL (it probably will be).

For clarity in both creating and reading, article types should be consistently titled, each according to its content’s primary information type. Each article type should use a consistent titling scheme so that (a) the author can accurately place it in the information hierarchy and (b) the reader can infer its content type from the title without further reading.

Please follow the following title conventions for at least these specific article types:

  • Gerunds for articles with tutorial, task, procedure, process, and similar content
    • Examples: "Using the <audio> tag", "Drawing on the canvas", “Interpreting getLocation() data”
  • Nouns and Noun phrases for articles with reference, syntactical, validity, and similar content, and also for articles with concept, guide, and overview content.
    • Examples: "<audio> tag attributes", "Valid .moveTo() values", "Latitude and longitude notation", "Introduction to Flexbox", "The history of the Web", “Information architecture basics”

Use capitals sparingly. Capitalize only the first word (sentence case); however, where the title includes an abbreviation, a proper name, or camel case, keep the capitalization. Some correct examples:

  • Style manual
  • The CSS layout model
  • Unicode characters in JavaScript files
  • Specifying fonts

Article summaries

All articles should fill in the article summary field. The contents of this field should be no more than a paragraph long and succinctly describe the contents of the page (for API pages, generally what this piece of the API accomplishes). This summary will be automatically included in other pages that link to this page.

Section headings

Generally, follow the same guidelines as for article titles. Make your section headings brief but meaningful. Use sentence case. Again, you want the reader to know what is in the section without having to read the section. However, you may want to draw the reader into a section by making the section title enticing, something like “Web standards rock!” or “What is localStorage?”

Grammar and spelling conventions

We follow the Yahoo style guide for language styles. Refer to it when you have a spelling, gramatical, or other language query. Here are a few quick tips:

  • Please do not use contractions. For example say “I am” compared to "I’m". This makes translation better and makes good legibility.

Common terms

  • Use Internet when it is a proper noun, e.g., The Internet. Otherwise, use lower case, e.g., Do you think internet marketing is a real degree?
  • Use Web when it is a proper noun, e.g., The Web. Otherwise, use lower case, e.g., I think CSS is a web-related topic.
  • Use website, not web site. Strictly speaking, it is a two-word, adjective-noun combination, but common use today (including recent inclusion in the AP Stylebook) is to combine them into a single noun.

Code syntax highlighting

WPD now uses Markdown to store its content. You can use typical Markdown syntax as GitHub documented it and it should work just fine in our pages.

Inline litteral usage

If you want to use an HTML/XML as part of the content, you’ll have to either escape it using backslash \,
for example an XML tag could be written like this <xml type="tag">foo</foo>,
or mark it between backticks (`) like that <xml type="tag">foo</xml>.

Code blocks

Another option is to create a code blocks by creating two lines starting by three backticks and an optionnal language identifier ```js

// JavaScirpt example
var foo = 'bar’;

Indented text becomes code automatically

Also, any text that starts by two or more spaces becomes automatically code blocks.


When adding images to an article, you should think carefully about how big the image needs to be (e.g. 300 x 150), as well as how heavy the image is (e.g. file size in KB), and what the file name is. Also consider the accessibility of your images by adding alt text to describe them.

  • Images should only be as large as required to display the content to be portrayed. To fit inside the content column on WPD, you should make them no larger than about 650 pixels wide. If an image absolutely needs to be much larger than this, you should display a thumbnail and then link it to a full size image somewhere else.

  • Please do not try to load images of several MB to WPD! If an image is really large in file size you should shrink it down first. If the image is something not very detailed like a line drawing, save it as a PNG 8 (most graphics packages have this option in their export settings.) If it is a lot more detailed, such as a browser screenshot or photograph, use a JPEG — 70% quality is sufficient for web use. You might also want to consider using a compression application like [PNG Crush].

  • Images should be given an appropriate semantic filename, for example box-shadow-output.jpg, not my-great-image.jpg or 454654756-awesome.jpg.

  • To add alt text to images in Media Wiki, you use the option alt=my alt text. For example:

    [[Image:cssbasic.png|alt=Screenshot of the Opera browser showing an applied inline style sheet]]

    Maps to

    <img src="cssbasic.png alt="Screenshot of the Opera browser showing an applied inline style sheet">

Quality principles

Developing Quality Technical Information: A Handbook for Writers and Editors defines the characteristics of quality in technical information as:

  • easy to use: task-oriented, accurate, complete
  • easy to understand: clear, concrete, appropriate style
  • easy to find: coherently organized, retrievable, visually effective

The following principles are chosen to help achieve high quality in the information presented on this website.

Free of spam

Spam makes it hard for readers to find what they are looking for, and should be removed as soon as possible.

Vendor neutral

Content should be vendor neutral whenever possible. Where browser implementations vary, provide compatibility information for major browsers, or describe equivalent functionality in major browsers.

Neutral voice

With the exception of tutorials and guides, content should maintain a neutral voice. Because the site is a collaborative wiki, even tutorials and guides that begin with a specific voice can be expected to morph over time.

Up to date

Content should include any new details that may be useful for web developers.

Tagged with all applicable tags

Tags help users of the site find content that is relevant to them, which means that having comprehensive and complete tagging is important. This includes tags that clearly denote its standardization progress and implementation status.

Include compatibility information

See Compatibility for a description of the best practices for formatting compatibility information.

Complete documentation of API

API reference pages should document the entirety of the API, as well as any quirks or edge cases that are important to know in practice.

Address relevant best practices

Authors are encouraged to address accessibility, internationalization, privacy, and security good practices.

Include examples where appropriate

Examples help make articles more concrete and easier to understand.

Follow best practices for sample code

It is particularly important that samples and example code follow best practices (for example, including alt text for image tags), because example code is often copied by developers. In particular, be sure that sample code does not create security vulnerabilities.

Include citations and helpful links

Include references to applicable standards, test suites, implementation reports, live demos, and other useful resources.


Your content should be accessible according to WCAG 2.0 AA. Where there are questions about accessibility, contributors should seek reviews from community members with more experience. Materials uploaded by agents of a browser vendor should be accessible when posted; materials uploaded by unaffiliated community members should be clearly marked if they are not accessible. If reasonable steps are not taken to make content accessible after a reasonable amount of time, it may be removed from the site.

Relevant to the site

Articles that are not relevant to the site’s goals (as laid out in the Pillars document) should not be included in the site.

Omit comments and discussion

Relevant comments and discussion about the article should occur in the associated discussion page, not in the body of the article.

Do not needlessly duplicate content

Separate pages should not substantially overlap content or topics, except when necessary to improve understanding and organization.

Search engine optimization

Use the relevant keywords for an article in the summary, and where possible and natural throughout the article. However, write for humans more than search engines, so do not overload on keywords.

Include all relevant sections

Different types of articles have different types of sections. For an article to be considered to be high quality, it should have all applicable sections.

Use accepted wikitext syntax conventions

WebPlatform Docs uses Semantic MediaWiki as its underlying engine, and has adopted certain conventions in the syntax that you should use when editing pages. This is the same wiki engine used by Wikipedia, and thus has the same basic coding characteristics. For general guidelines, see:

For help with some specific WPD coding issues, see: