src/vs/base/browser/fastDomNode.ts/FastDomNode/setContain
class FastDomNode:	public setContain(contain: 'none' | 'strict' | 'content' | 'size' | 'layout' | 'style' | 'paint'): void {
		if (this._contain === contain) {
			return;
		}
		this._contain = contain;
		(<any>this.domNode.style).contain = this._contain;
	}