A Scriptish First - @run-at
This is actually a funny story. Way back when Google Chrome announced that it
would support user scripts natively
there was this lonely and sparse page of documentation provided
which described a new feature, @run-at. From reading this documentation
one was lead to believe that by adding a
@run-at document-start metadata key/value pair to their user script it would
be executed when a page begins loading, before the default point at which user
scripts are loaded (ie: the DOM loaded event).
There was a bunch of talk about implementing this in Greasemonkey for a long time, and this became one of the features that I felt I must have for my Firefox experience, so it became one of many reasons why I decided to finally fork Greasemonkey and make Scriptish last year.
When I finally got around to implementing the feature I wanted to test things
out and see if there were are discernible differences between Scriptish’s
@run-at and Google Chrome’s. This is when I realized that Google Chrome’s
@run-at wasn’t working as advertised if at all, so I created Google
Chrome bug 61856
in which I learned it hadn’t actually been implemented at all.
So Scriptish was the first user script engine to implement @run-at.
Finally though Google Chrome has implemented the feature, and recently Greasemonkey started to support the feature as well, so things are looking up for the community!