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Showing content from https://docs.github.com/en/contributing/writing-for-github-docs/versioning-documentation below:

Versioning documentation - GitHub Docs

GitHub Docs uses YAML frontmatter and liquid operators to support multiple versions of GitHub with a single-source approach.

On GitHub Docs, we provide versions of our documentation that reflect the differences in UI and functionality across GitHub's major product offerings. Contributors can use versioning syntax to scope content to a specific product offering.

Versioning syntax allows the reader to manually choose the version of the documentation that applies to the product they're using. GitHub Docs' URLs can also include versioning information, which allows links from one version of GitHub Docs to another to send the reader directly to documentation for the product they're using.

Versioning for content on GitHub Docs is single-source to avoid repetition and keep prose DRY. For articles, you apply versioning to an individual Markdown file with YAML metadata, then use conditional statements within the file's prose to instruct the site which text to display depending on the version the reader selects. Single-sourcing contrasts to the creation of separate files that reflect each version of the content.

There are two types of versioning syntax for GitHub Docs.

• YAML: Used most often in YAML front matter within Markdown files in content/, but also in many types of YAML files in data/. Indicates the versioning for an entire piece of content.

  versions:
    PRODUCT: 'VERSIONS'
    PRODUCT: 'VERSIONS'
    ...
  

  The following example shows content versioned for Free, Pro, & Team, and all versions of GitHub Enterprise Server.

  versions:
    fpt: *
    ghes: *
  

• Liquid: Used within Markdown files in content/ and data/reusables/, variable strings within YAML files in data/variables/, or strings within data/glossaries/external.yml. Indicates which text should appear when a reader chooses a version for content that has multiple versions defined by YAML front matter.

  • Product-based versioning:

    {% ifversion SHORT-PRODUCT-NAME %} ... {% endif %}
    

  • Feature-based versioning:

    {% ifversion FEATURE-NAME %} ... {% endif %}
    

We provide versioned documentation for users of GitHub plans including GitHub Enterprise Cloud and GitHub Enterprise Server. If multiple versions of a page exist on the site, readers can choose the version from the version picker at the top of the page.

Documentation for GitHub.com has two possible versions:

For Free, Pro, or Team plans on GitHub.com, use free-pro-team@latest. The short name is fpt.

For GitHub Enterprise Cloud, use enterprise-cloud@latest. The short name is ghec.

Documentation for GitHub Enterprise Server has multiple versions and can be divided into two types: documentation for supported releases (we support four at any one time), and documentation for closing down releases (we do not link to these on the Docs site but we support a "frozen" snapshot of these docs in perpetuity, so they can still be accessed if you know the URLs). See lib/enterprise-server-releases.js for a list.

The versions are named enterprise-server@<release>. The short name is ghes. In Liquid conditionals, we can specify ranges, like ghes > 3.0. For more information, see Versioning with Liquid conditional operators.

You can use the versions property within a file's frontmatter to define which products an article will appear for. Index files require a versions property, but they will be automatically versioned based on the versions of their children.

For example, the following YAML frontmatter will version an article for GitHub Enterprise Server 2.20 and above and Free, Pro, or Team.

title: About your personal dashboard
versions:
  fpt: '*'
  ghes: '>=2.20'

The following example will version an article for all supported versions of GitHub Enterprise Server:

title: Downloading your license
versions:
  ghes: '*'

You can also version a page for a range of releases. The following example will version the page for Free, Pro, & Team, GitHub Enterprise Cloud, and GitHub Enterprise Server versions 3.1 and 3.2 only:

versions:
  fpt: '*'
  ghec: '*'
  ghes: '>=3.1 <3.3'

We use the Liquid template language (specifically, this Node.js port) and a custom {% ifversion ... %} tag to create versions of our documentation.

If you define multiple products in the versions key within a page's YAML frontmatter, you can use the conditional operators ifversion/else (or ifversion/elsif/else) in the Markdown to control how the site renders content on the page for a particular product. For example, a feature may have more options on GitHub.com than on GitHub Enterprise Server, so you can version the content appropriately via the versions frontmatter, and use Liquid conditionals to describe the additional options for GitHub.com.

Note

• Use ifversion for product-based versioning and feature-based versioning.
• Do not use if or unless.
• Make sure to use elsif and not else if. Liquid does not recognize else if and will not render content inside an else if block.

For versions that don't have numbered releases (like fpt and ghec), you have two options:

• {% ifversion ghec %}
• {% ifversion not ghec %}

For versions that have numbered releases (currently only ghes), you can do the same for content that is either available in all of the releases or not available in any of the releases:

• {% ifversion ghes %}
• {% ifversion not ghes %}

If you need to denote content that is only available (or not available) in certain releases, you can use the following operators:

The Liquid operators ==, >=, and <= are not supported in the GitHub Docs.

When all operands must be true for the condition to be true, use the operator and:

{% ifversion ghes > 2.21 and ghes < 3.1 %}

When at least one operand must be true for the condition to be true, use the operator or:

{% ifversion fpt or ghes > 2.21 %}

Do not use the operators && or ||. Liquid does not recognize them, and the content will not render in the intended versions.

When using Liquid conditionals in lists, you can use whitespace control characters to prevent the addition of newlines and other whitespace that would break the list rendering.

You can add a hyphen (-) on either the left, right, or both sides to indicate that there should be no newline or other whitespace on that side.

{%- ifversion fpt %}

For example, to version one step of a procedure, instead of adding liquid versioning for the step starting at the end of the previous step, like this:

1. This step is for all versions{% ifversion ghes %}
1. This step is for GHES only{% endif %}
1. This step is for all versions

You can include the liquid versioning on its own line and use whitespace control to strip the newline to the left of the liquid tag. This makes reading the source much easier, without breaking the rendering of the list:

1. This step is for all versions
{%- ifversion ghes %}
1. This step is for GHES only
{%- endif %}
1. This row is for all versions

When you document any new change or feature, use feature-based versioning.

A small minority of features and changes will only ever apply to one product. The majority of features come to GitHub.com and eventually reach all products. In general, changes "flow" from GitHub.com (including GitHub Enterprise Cloud) to GitHub Enterprise Server.

Feature-based versioning provides named "feature flags" that simplify the maintenance and versioning of documentation. You can use a single feature name (or "flag") to group and version prose throughout content. When a feature comes to additional products, you only need to make a change to the YAML versioning in the file within data/features/.

Each feature is managed through individual YAML files in data/features/.

Note

Do not delete data/features/placeholder.yml because it is used by tests.

To create a new feature, first create a new YAML file with the feature name you want to use in this directory. For a feature named meow, that would be data/features/meow.yml.

Add a versions block to the YAML file with the short names of the versions the feature is available in. For example:

versions:
  fpt: '*'
  ghec: '*'
  ghes: '>3.1'

The format and allowed values are the same as the frontmatter versions property. For more information, see Versions in the github/docs repository README.

Now you can use {% ifversion meow %} ... {% endif %} in content files!

You can also use the feature in frontmatter in content files:

versions:
  feature: 'meow'

You can only use one feature entry under versions, and the value of feature can only contain one feature name.

You can combine feature-based versioning and standard versioning in frontmatter. When you do this the article will be included in the superset of all of the versions specified in the feature-based versioning file and directly in the Markdown file. For example, you might have a feature that is currently only available in GHEC, and this is specified in the feature-based versioning. However, you want the "About" article for this feature to also be visible in the FPT docs. In this case you could add fpt and feature to the versions block in the front matter:

versions:
  fpt: '*'
  feature: 'some-new-feature'

Versioned content impacts the reader, but also impacts anyone who contributes to or reviews the content. Here are a few tips to improve the writing, reading, and reviewing experience for versioning syntax. None of these practices are mandatory and you will find edge and corner cases, but they're intended as useful heuristics to help you think through versioning.

For the reader, gaining a general understanding is more important than reading details that precisely reflect the differences between particular products or plans. In conceptual or procedural content, try to describe features or portions of the UI in a general way that doesn't require versioning syntax. In addition to being easier for us to maintain, this strengthens understanding for readers who refer to documentation for multiple products.

• Do ask yourself, "can I write this content in a way that applies to all products without any versioning?"
• Do try to avoid versioning screenshots if you can, given the effort required to create them. Minor differences between UI copy may not affect understanding. If product-specific text or UI elements exist, but the screenshot still provides helpful context, ask yourself whether versioning the screenshots would affect understanding to a meaningful degree.
• Don't version prose if you can explain a concept or walk the reader through a procedure without versioning for specific products.

Staying cognizant of existing versioning will help ensure that you write relevant versioning statements, and can help remind you to version new content accurately.

• Do review the entire page's versioning in the front matter as soon as you begin editing.
• Do review the versioning around content that you're editing.
• Do review the rendered version of changes that you're making, and switch to each available version for the page as part of your self-review.

Use versioning syntax within a sentence or paragraph to differentiate prose for two different plans or products. A contributor can edit just one paragraph with versioning statements, instead of needing to consider larger blocks of versioned text and modify similar but differently versioned prose in two places. A reviewer can suggest a change once, instead of needing to leave the same suggestion in multiple places. But if the behavior differs dramatically or versioning within the sentence or paragraph becomes complicated or difficult for a contributor to parse, consider repeating yourself to make the prose easier to maintain.

• Do use versioning syntax inline within paragraphs to avoid repeating sentences or entire paragraphs.

  You can do {% ifversion fpt %}something{% elsif ghec %}something else{% endif %}.

• Do use your judgment: for prose that would be complicated to write or read without lots of versioning syntax within a sentence or paragraph, consider repeating the entire paragraph in a version block for each relevant product.

  {% ifversion fpt %}

  If you use a Free, Pro, or Team plan, you can do something. Here's more information about the things you can do with a Free, Pro, or Team plan...

  {% elsif ghec %}

  If you use GitHub Enterprise Cloud, you can do something else. Here's more information about the things you can do with GitHub Enterprise Cloud...

  {% endif %}

If you know exactly which products the content describes, version explicitly for those products. Syntax like not, and else in particular, can be imprecise. The end result of not and else depend on each article's front matter, so a contributor must do more investigation to understand prose with this versioning. This creates the potential for errors. The complexity of implicit versioning increases in reusables, where articles that reference the reusable may have different versioning, and thus different evaluations of not or else. We also occasionally introduce a new version to GitHub Docs when GitHub introduces a new product, which changes the end result of not and else when we add the new version to existing articles.

• Do remember that GitHub offers four products, and remember that GitHub Docs can display documentation for eight total versions at any given time.
• Do review an entire article's versioning in the front matter when you begin editing, as this can help you understand how not and else will behave in Liquid statements, or change when you enable new versions in the front matter.

Sometimes a change isn't included in the release it was originally intended for. You can save time for reviewers and ensure more accurate content by confirming versioning throughout content design and creation, for both releases and improvements.

• Do consider versioning in content design, and do double-check the versioning when you request stakeholder reviews for content creation.
• Do make the review easier for other writers and stakeholders: point out differences between versions in your request for review, linking to specific rendered versions of the content if necessary.
• Do trust, but verify.

Whether you're writing the content or reviewing the content, pay attention to the content design plan and affected products, and check the rendered content in a staging or development environment to ensure that the content describes each product accurately.

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