src/vs/editor/browser/viewParts/blockDecorations/blockDecorations.ts/BlockDecorations/constructor
class BlockDecorations:	constructor(context: ViewContext) {
		super(context);

		this.domNode = createFastDomNode<HTMLElement>(document.createElement('div'));
		this.domNode.setAttribute('role', 'presentation');
		this.domNode.setAttribute('aria-hidden', 'true');
		this.domNode.setClassName('blockDecorations-container');

		this.update();
	}