This guide is for authors of Plone Documentation. It covers how to run a live preview of documentation while editing, build documentation, and perform quality checks. For general markup syntax, see MyST reference.
Synchronize the browser while editing#
sphinx-autobuild to view changes in the browser while you edit documentation.
You can open a browser at http://127.0.0.1:8000/ to preview the documentation.
We strive for high quality documentation, setting the following minimum standards.
Markup syntax must be valid#
See both the specific markup syntax above and general markup in MyST reference.
To validate markup, run the following command.
/_build/html/index.html in a web browser.
American English spelling, grammar, and syntax, and style guide#
Spellings are enforced through
Plone uses American English.
Spelling is configured in
.vale.ini, and in files in
Authors should add new words and proper names using correct casing to
styles/Vocab/Plone/accept.txt, sorted alphabetically and case-insensitive.
Vale also provides English grammar and syntax checking, as well as a Style Guide. We follow the Microsoft Writing Style Guide.
To perform all these checks, run the following command.
Because it is difficult to automate good American English grammar and syntax, we do not strictly enforce it. We also understand that contributors might not be fluent in English. We encourage contributors to make a reasonable effort, and to request a review of their pull request from community members who are fluent in English to fix grammar and syntax. Please ask!
All links must be valid#
Before you add a link, consider whether you really need it for the documentation.
Avoid linking to blog posts because they rapidly succumb to bitrot.
It is preferred to copy the content from the source and add a link to the source as a reference through a
seealso admonition or footnote, than to merely link to the source.
Valid links are enforced automatically through Sphinx's
Configuration of the
linkcheck builder is in
linkcheck_ignore supports regular expression syntax.
When authors add a link to the documentation, it must be a valid public URL without requiring authentication.
If it is not a valid link, or is private or local, then you must exclude it from
linkcheck by wrapping it in single backticks.
Visit the URL `http://www.example.com` for an example.
This will render as follows.
Visit the URL
http://www.example.comfor an example.
If a link has succumbed to bit rot, then try finding the most recently scraped version on the Internet Archive Wayback Machine, and update the link.
To validate links, run the following command.
/_build/linkcheck/output.txt for a list of broken links.
Please do not abuse
There is a special place in hell reserved for contributors who do not bother to update bad links, either dead ones or redirects, causing
linkcheck to fail.
And there is a doubly punishing place for those who disable
linkcheck because there are too many bad links.
Please do not be "that person".
Pygments provides syntax highlighting in Sphinx.
When including code snippets, you should specify the language. Authors must use a proper Pygments lexer and not generate warnings.
The snippet must be valid syntax for the language you specify, else it will not be highlighted properly. Avoid adding comments to code snippets, unless you use valid comment syntax for that language. For example, JSON does not allow comments.
Do not indicate elided or omitted code with ellipses (
These are almost never valid syntax and will cause syntax highlighting to fail for the code block.
Choosing a Lexer#
Some lexers are less than perfect.
If your code block does not highlight well, then consider specifying a less ambitious lexer, such as
shell for commands to be issued in a terminal session.
Do not include shell prompts.
This will make commands easy to copy and paste for readers.
console for output of a shell session.
If you have a mix of a shell command and its output, then use
xml does not work well, then try
jsx has a complex syntax that is difficult to parse.
We have high hopes for the project
We include it in our
Please contribute to its further development.
less are also suboptimal and particular.
If no other lexer works well, then fall back to
At least then the build will succeed without warnings, although syntax highlighting for such snippets will not appear.
Validate the lexer#
Always build the page to validate syntax. The change should not be merged if there are any Sphinx warnings. The Sphinx console will display any warnings, such as the following.
/Plone/documentation/classic-ui/bodyclasses.md:10: WARNING: Could not lex literal_block as "python". Highlighting skipped.
The above warning indicates that the syntax is not valid. Common mistakes include:
…to indicate omitted code. It is preferable to never use ellipses. If you must do that, comment it out using the language's comment syntax.
Using comments in JSON.
A previous code block bleeds through to the next due to invalid MyST syntax.
To validate code block syntax, run the following command.
An online demo of all lexers that Pygments supports may be helpful to test out your code blocks and snippets for syntax highlighting.
You can also use the
When using the online lexer, if any red-bordered rectangles appear, then the lexer for Pygments interprets your snippet as not valid. You can search the Pygments issue tracker for possible solutions, or submit a pull request to enhance the lexer.
HTML and Open Graph metadata#
All documents must have a
myst topmatter key with an
html_meta directive at the top of every page.
When rendered to HTML, it inserts
<meta> tags for improved search engine results and nicer social media posts.
Authors should include at least
keywords meta tags.
The following is an example of
Note that the content of the two tags
property=og:description should be identical.
--- myst: html_meta: "description": "Authors' guide to writing Plone Documentation. It covers configuring quality checks and syntax for writing markup that is of particular interest to authors." "property=og:description": "Authors' guide to writing Plone Documentation. It covers configuring quality checks and syntax for writing markup that is of particular interest to authors." "property=og:title": "Authors Guide" "keywords": "Plone, Documentation, SEO, meta, Vale, spell, grammar, style, check, linkcheck, lexer" ---
This renders in the HTML
<head> section as follows.
<meta content="Authors' guide to writing Plone Documentation. It covers configuring quality checks and syntax for writing markup that is of particular interest to authors." name="description" /> <meta content="Authors' guide to writing Plone Documentation. It covers configuring quality checks and syntax for writing markup that is of particular interest to authors." property="og:description" /> <meta content="Authors Guide" property="og:title" /> <meta content="Plone, Documentation, SEO, meta, Vale, spell, grammar, style, check, linkcheck, lexer" name="keywords" />
Additional Open Graph metadata is implemented through the Sphinx extension
sphinxext-opengraph and the MyST
html_meta directive, which resolves to the Docutils
See the site-wide configuration in
Plone documentation styleguide#
We follow Microsoft Writing Style Guide.
Key concepts from that guide include the following.
Documentation should be informational, but friendly.
Address the reader by using "you" instead of "the user".
Headings should be Sentence cased, not Title Cased.
The Plone Documentation Team adopted additional guidelines.
Use one sentence per line. Keep sentences short and understandable. This will greatly improve the editing and maintenance of your documentation.
Do not follow PEP8 maximum line length standard. Documentation is narrative text and images, not Python code.
-in filenames and avoid underscores.
Images should be no wider than 740 pixels to fit within the documentation's main view port. This avoids scaling and reducing legibility of images. To make that work in Volto, set your browser width to 1180 pixels. You will notice that the drag and trash icons for each block move inside the block from outside.
In user documentation, provide screenshots of each step where the interface changes. It is painstaking, but worth the effort. Provide sufficient detail of what each option is and does.