When you compose a new message in Gmail on a computer, the bottom of the compose window looks like this:
When you put your mouse over the
+ button, it looks like this (with the mouse being on the icon with the tooltip)
I'm not understanding the rationale for hiding these five additional buttons until the user hovers over the
+ button. There is enough real estate that this would not be necessary and it seems to me that there are downsides, notably the lack of immediate visibility making these features less discoverable (not to mention that it's not obvious what the
+ button is for). Indeed, I would think that they ought to always be visible. I haven't seen this sort of interface before and I'd like to think that Google had a good reason to do this. Could someone please let me know what it is?