proposal
Material shadow for the toolbar, users might write their own styles to simulate Material shadow for the toolbar, but it would be better if we can define it and users can just activate it easily.

(source)
(as far as I know) there is not any shadow for the toolbar
Current Angular Material Toolbar
To follow Material rules, and provide high-quality shadow (as Material describe) for toolbar
It's as easy as class="mat-elevation-z*" where * is 0..24
Then I can close the issue!
I did not know about the mat-elevation-z* class!
Thanks
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Most helpful comment
It's as easy as
class="mat-elevation-z*"where * is 0..24https://plnkr.co/edit/w9eFAtAyksvxuSYKGYw1?p=preview