I'm designing a favicon in Illustrator and I'd like to see what it would look like in pixels at 128px and 16px as I'm working on it. Is this possible?
Edit Found the answer - posted below.
you can do any version of your design while you are working in a bigger version of it by using symbols here you are the steps.
now you every time you want to work on to a new version you just drop a new symbol into your artboard and resize it to your desire dimension. and when you want to change the small version of your icon just double click the bigger version of the symbol and change it in the isolated mode. and this will ensure modifying the other version.
After digging around some more, I realized it behaves just like Photoshop.
Window > New Window, then adjust the window appearance accordingly.
You could do a quick
File > Save for Web (Cmd/Ctrl+Option/Alt+Shift+S), and then adjust the image size to see what it will look like.
Then just press
Cancel (Esc) to back out to your drawing. You don't have to actually save it, just use it as a preview.