For some of the new APIs we introduce in Chromium, you need to set a browser flag for experimentation. This article explains how to do this in the various Chromium derivatives like Google Chrome, Microsoft Edge, and others.
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all users to experience the web. A lot of web browsers are built on Chromium, including the popular browsers Google Chrome by Google, Microsoft Edge by Microsoft, Opera Web Browser by Opera, and many others.
Google Chrome has since the beginning supported a special scheme called
chrome:// for accessing
browser-internal settings or features. You can see the full list by putting
chrome://chrome-urls into the URL bar. The special URL of interest here is
Setting browser flags
For some new APIs in Chromium, you need to set a browser
flag for experimentation. You guessed it,
chrome://flags is where this happens. The most popular flag we
ask you to set is
chrome://flags/#enable-experimental-web-platform-features, which, as the name
suggests, enables experimental web platform features.
Something interesting happens, though, if you enter a
chrome:// URL into a browser that is not
Chrome. For example, if you enter
Microsoft Edge, you will notice that it gets rewritten as
edge://flags/#enable-experimental-web-platform-features. All vendors have created this rewrite
mechanism, which makes sense, as Edge is not Chrome, although it is based on Chromium.
We strive for making our documentation inclusive of different browsers, so, for example, telling a
Brave user to navigate to
chrome://flags to toggle a given flag—while it
works thanks to the rewrite mechanism—may not be the most welcoming experience. At the same time,
listing all possible vendor schemes like
brave://, etc. is not a great
One scheme to rule them all
Luckily there is a hidden champion scheme that fits all our needs:
about://. In Chrome,
URLs get rewritten to
chrome://, in Edge to
edge://, and so on for all vendors. We are in this
web thing together, and this is
about:// all of us! Whenever you see instructions that include the
about:// scheme, your Chromium browser of choice will do the right thing.