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There are differences in how commands like shortcuts are triggered in chrome scope across platforms. While on Windows and Linux the Ctrl key is used, on OS X it is the Cmd key. That implies that for each shortcut you have to check the platform first, and then set the correct modifier key. Example: Open the find bar in Firefox (Linux/Windows: Ctrl+F, OS X: Cmd+F) To make it easier to use, it would be really helpful if a new "meta" key could be added to the spec. For several test frameworks here at Mozilla we have it named accelKey: http://mxr.mozilla.org/mozilla-central/source/testing/marionette/EventUtils.js#134 Inside the framework a check for the platform ensures that the correct modifier is used. So it is not a requirement for the test itself.
'Meta' is a different key. https://en.wikipedia.org/wiki/Meta_key 'CommandOrControl' is maybe a better name. But I don't think we should fix this at all. Using browser features with key shortcuts is not specified and in some UAs it won't do anything at all.