MatDialogConfig.id does not work?

[goldenbull]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

As the doc:
id: string | ID for the dialog. If omitted, a unique one will be generated.

What is the current behavior?

the generated dialog has no ID attribute:
<mat-dialog-container class="mat-dialog-container ng-tns-c1-0 ng-trigger ng-trigger-slideDialog ng-star-inserted" tabindex="-1" role="dialog" style="transform: none; opacity: 1;">...</mat-dialog-container>

What are the steps to reproduce?

    const dialogRef = this.dialog.open(PopupFormComponent, {
      id: 'dlg000',
      height: 200,
      width: 300
    });

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 5.2.0, Material 5.1.0

[crisbeto]

The main purpose of the id was to be able to get a hold of an arbitrary MatDialogRef. That being said, as a side-effect of #9379 it'll be added to the dialog container.

[goldenbull]

I'm newbie of the web world, sorry for bothering you with my simple questions.
If the id field will not exist in the generated HTML, what's the proper way to customize the <mat-dialog-container> element style? For example, to set the padding=0px instead of the default CSS setting.

[crisbeto]

You can pass in the panelClass option and use that class to target your dialog.

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