No, that feature isn't directly available on the GitHub web interface (as opposed to the "Revert" button recently added for GitHub for Mac/Windows)
Actually, it is for pull requests only, since June 24th, 2014:
Introducing the Revert Button
you can easily revert a pull request on GitHub by clicking Revert:

You'll be prompted to create a new pull request with the reverted changes:

git revert is a bit more complex to manage through the web as it can accept a range of commits.
It shouldn't be an issue in terms of collaboration though: a revert adds a new commit, it doesn't change the history of existing commits.
No, that feature isn't directly available on the GitHub web interface (as opposed to the "Revert" button recently added for GitHub for Mac/Windows)
Actually, it is for pull requests only, since June 24th, 2014:
Introducing the Revert Button
you can easily revert a pull request on GitHub by clicking Revert:

You'll be prompted to create a new pull request with the reverted changes:

git revert is a bit more complex to manage through the web as it can accept a range of commits.
It shouldn't be an issue in terms of collaboration though: a revert adds a new commit, it doesn't change the history of existing commits.
If you want to use just GitHub web, (and you don't mind removing the commit from history instead of leaving a revert commit), there is a tedious way.
Step 1. Goto commit history, find the commit hash which you want to rewind to; and click "Browse repo at this point in history"
Step 2. Create a new branch from this commit hash (say "temp")
Step 3. Delete the branch which had the problem (say "main")
Step 4. Goto "temp" branch and create "main" branch from it. And you're done.
Of course, this is not a good way and it might only work for recently created commits.
Hi, I messed up with something and would like to rollback, I googled up I can't find any tutorial to do it from the website itself. Most of them talk with CLI. I'm currently on a machine where I don't have permission to install anything, how to rollback from the site?
I've been trying to find instructions for reverting a commit in the online version of Github - not the desktop version. Lots of info out there about how to do this in the desktop version, but is this possible using the browser version?
I want to delete the last 3 commits.
How do you checkout, revert and reset commits in the GitHub Browser?
I want to continue from a certain point in my main branch.
You can't. GitHub does not have a web API call to do this.
The full API can be found here.
What can you do?
Since we don't have shell access on the Chromebooks...
You can always revert locally and then push your code with -f to force the code to be pushed, but since you don't have command line to do it you will need to manually revert your code and commit the "old" code back.
If you do have the option to use a CLI, rather than the GitHub website, take a look at this answer. It will be very helpful for you. It describes in detail how to revert commits in various ways using the CLI.
How to move HEAD back to a previous location? (Detached head)
You can revert a merged commit by: going to pull requests and change filter for closed:

then chose merge you want to revert and click on revert
