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Document pull request previews

This documents the pull request previews we recently added when working on
J. Ryan Stinnett 2 years ago
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# Pull Request Previews
Pull requests to the React SDK layer (and in the future other layers as well)
automatically set up a preview site with a full deployment of Element with the
changes from the pull request added in so that anyone can easily test and review
them. This is especially useful for checking visual and interactive changes.
To access the preview site, scroll down to the bottom of the PR where the
various CI results are displayed:
![Pull request: checks section](./img/pr-checks.png)
The checks section could be collapsed at first, so you may need to click "Show
all checks" to reveal them. Look for an entry that mentions `deploy-preview`. It
may be at the end of the list, so you may need scroll a bit to see it. To access
the preview site, click the "Details" link in the deploy preview row.
**Important:** Please always use test accounts when logging into preview sites,
as they may contain bugs or other issues that could damage your account.
## FAQs
### Are preview sites created for pull requests from contributors?
Yes, they are created for all PRs from any author.
### Do preview sites expire after some time period?
No, there is no expiry date, so they should remain accessible indefinitely, but
of course they obviously aren't meant to live beyond the development workflow,
so please don't rely on them for anything important. They may disappear at any
time without notice.


@ -73,10 +73,9 @@ functionality is:
required (though may still be useful) since we can continue tweaking
As it can be difficult to review design work from looking at just the changed
files in a PR, authors should be prepared for Design and / or Product teams to
request a link to an ad-hoc build of Element (hosted anywhere) that can be used for
the review. In the future, we [hope to automate
this]( for every PR.
files in a PR, a [preview site](./ that includes your changes
will be added automatically so that anyone who's interested can try them out
Before starting work on a feature, it's best to ensure your plan aligns well
with our vision for Element. Please chat with the team in