Searching for site: developer.mozilla.org "deprecated" should reveal some deprecated browser API's and JavaScript stuff. I think the Chrome team wait until less

Searching for site: developer.mozilla.org "deprecated" should reveal some deprecated browser API's and JavaScript stuff. I think the Chrome team wait until less then two million sites use something before removing it. For example sync XHR is currently on the deprecation list and will be removed once the usage is low enough. If sync XHR is removed you can no longer sync load modules on the web.