Then, submit your image(s) in a separate pull request to the [qubes-attachment](https://github.com/QubesOS/qubes-attachment) repository using the same path and filename.
In cases where a documentation page covers functionality that differs considerably between Qubes OS versions, the page should be subdivided into clearly-labeled sections that cover the different functionality in different versions:
### Incorrect Example ###
```
# Page Title #
## How to Foo ##
Fooing is the process by which one foos. There are both general and specific
versions of fooing, which vary in usefulness depending on your goals, but for
the most part, all fooing is fooing.
To foo in Qubes 3.2:
$ qvm-foo <foo-bar>
Note that this does not work in Qubes 4.0, where there is a special widget
for fooing, which you can find in the lower-right corner of the screen in
the Foo Manager. Alternatively, you can use the more general `qubes-baz`
command introduced in 4.0:
$ qubes-baz --foo <bar>
Once you foo, make sure to close the baz before fooing the next bar.
```
### Correct Example ###
```
# Page Title #
## Qubes 3.2 ##
### How to Foo ###
Fooing is the process by which one foos. There are both general and specific
versions of fooing, which vary in usefulness depending on your goals, but for
the most part, all fooing is fooing.
To foo:
$ qvm-foo <foo-bar>
Once you foo, make sure to close the baz before fooing the next bar.
## Qubes 4.0 ##
### How to Foo ###
Fooing is the process by which one foos. There are both general and specific
versions of fooing, which vary in usefulness depending on your goals, but for
the most part, all fooing is fooing.
There is a special widget for fooing, which you can find in the lower-right
corner of the screen in the Foo Manager. Alternatively, you can use the
general `qubes-baz` command:
$ qubes-baz --foo <bar>
Once you foo, make sure to close the baz before fooing the next bar.
```
[Here][version-example] is a good example of a page that is correctly subdivided to account for version-specific differences.
Subdividing the page into clearly-labeled sections for each version has several benefits:
* It preserves good content for older (but still supported) versions.
Many documentation contributors are also people who prefer to use the latest version.
Many of them are tempted to *replace* existing content that applies to an older, supported version with content that applies only to the latest version.
This is somewhat understandable.
Since they only use the latest version, they may be focused on their own experience, and they may even regard the older version as deprecated, even when it's actually still supported.
However, allowing this replacement of content would do a great disservice to those who still rely on the older, supported version.
In many cases, these users value the stability and reliability of the older, supported version.
With the older, supported version, there has been more time to fix bugs and make improvements in both the software and the documentation.
Consequently, much of the documentation content for this version may have gone through several rounds of editing, review, and revision.
It would be a tragedy for this content to vanish while the very set of users who most prize stability and reliability are depending on it.
* It's easy for readers to quickly find the information they're looking for, since they can go directly to the section that applies to their version.
* It's hard for readers to miss information they need, since it's all in one place.
In the incorrect example, information that the reader needs could be in any paragraph in the entire document, and there's no way to tell without reading the entire page.
In the correct example, the reader can simply skim the headings in order to know which parts of the page need to be read and which can be safely ignored.
The fact that some content is repeated in the two version-specific sections is not a problem, since no reader has to read the same thing twice.
Moreover, as one version gets updated, it's likely that the documentation for that version will also be updated.
Therefore, content that is initially duplicated between version-specific sections will not necessarily stay that way, and this is a good thing:
We want the documentation for a version that *doesn't* change to stay the same, and we want the documentation for a version that *does* change to change along with the software.
* It's easy for documentation contributors and maintainers to know which file to edit and update, since there's only one page for all Qubes OS versions.
Initially creating the new headings and duplicating content that applies to both is only a one-time cost for each page, and many pages don't even require this treatment, since they apply to all currently-supported Qubes OS versions.
By contrast, an alternative approach, such as segregating the documentation into two different branches, would mean that contributions that apply to both Qubes versions would only end up in one branch, unless someone remembered to manually submit the same thing to the other branch and actually made the effort to do so.
Most of the time, this wouldn't happen.
When it did, it would mean a second pull request that would have to be reviewed.
Over time, the different branches would diverge in non-version-specific content.
Good general content that was submitted only to one branch would effectively disappear once that version was deprecated.
(Even if it were still on the website, no one would look at it, since it would explicitly be in the subdirectory of a deprecated version, and there would be a motivation to remove it from the website so that search results wouldn't be populated with out-of-date information.)
For further discussion about version-specific documentation in Qubes, see [here][version-thread].
* In order to enable offline browsing, use relative paths (e.g., `/doc/doc-guidelines/` instead of `https://www.qubes-os.org/doc/doc-guidelines/`, except when the source text will be reproduced outside of the Qubes website repo.
Examples of exceptions:
* [QSBs] (intended to be read as plain text)
* [News] posts (plain text is reproduced on the [mailing lists])
* URLs that appear inside code blocks (e.g., in comments and document templates)
* Insert a newline at, and only at, the end of each sentence, except when the text will be reproduced outside of the Qubes website repo (see previous item for examples).
* Rationale: This practice results in one sentence per line, which is most appropriate for source that consists primarily of natural language text.
It results in the most useful diffs and facilitates translation into other languages while mostly preserving source readability.
* If appropriate, make numerals in numbered lists match between Markdown source and HTML output.
* Rationale: In the event that a user is required to read the Markdown source directly, this will make it easier to follow, e.g., numbered steps in a set of instructions.
