Overview for toolbar
<mat-toolbar> is a container for headers, titles, or actions.
In the most situations, a toolbar will be placed at the top of your application and will only have a single row that includes the title of your application.
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The Material Design specifications describe that toolbars can also have multiple rows. Creating
toolbars with multiple rows in Angular Material can be done by placing <mat-toolbar-row> elements
inside of a <mat-toolbar>.
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Note: Placing content outside of a <mat-toolbar-row> when multiple rows are specified is not
supported.
The toolbar does not perform any positioning of its content. This gives the user full power to position the content as it suits their application.
A common pattern is to position a title on the left with some actions on the right. This can be
easily accomplished with display: flex:
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The color of a <mat-toolbar> can be changed by using the color property. By default, toolbars
use a neutral background color based on the current theme (light or dark). This can be changed to
'primary', 'accent', or 'warn'.
By default, the toolbar assumes that it will be used in a purely decorative fashion and thus sets
no roles, ARIA attributes, or keyboard shortcuts. This is equivalent to having a sequence of <div>
elements on the page.
Generally, the toolbar is used as a header where role="heading" would be appropriate.
Only if the use-case of the toolbar match that of role="toolbar", the user should add the role and
an appropriate label via aria-label or aria-labelledby.