Note: Read this comment to make sure you’re up-to-speed on what this issue is and is not about: #5377 (comment)

For React/JSX - Prettier has an option to allow tags to close on the same line as the declaration, rather then on a new line:
jsxBracketSameLine: true:

<button
  className="prettier-class"
  id="prettier-id"
  onClick={this.handleClick}>
  Click Here
</button>

jsxBracketSameLine: false:

<button
  className="prettier-class"
  id="prettier-id"
  onClick={this.handleClick}
>
  Click Here
</button>

With Prettier 1.15.1, at least for the Angular parser, there is no corresponding option, so all HTML is formatted like this:
Input:

<my-component class="wcd-flex-1 dialog-contents wcd-scroll-vertical"
		      [foo]="bar">
</my-component>

Output:

<my-component
    class="wcd-flex-1 dialog-contents wcd-scroll-vertical"
	[foo]="bar"
>
</my-component>

Playground link

It would be nice to have a flag to set it such that the output of the above would be:

<my-component
    class="wcd-flex-1 dialog-contents wcd-scroll-vertical"
	[foo]="bar">
</my-component>