src/vs/editor/standalone/browser/standaloneThemeServiceImpl.ts/StandaloneThemeServiceImpl/_registerShadowDomContainer
class StandaloneThemeServiceImpl:	private _registerShadowDomContainer(domNode: HTMLElement): IDisposable {
		const styleElement = dom.createStyleSheet(domNode);
		styleElement.className = 'monaco-colors';
		styleElement.textContent = this._allCSS;
		this._styleElements.push(styleElement);
		return {
			dispose: () => {
				for (let i = 0; i < this._styleElements.length; i++) {
					if (this._styleElements[i] === styleElement) {
						this._styleElements.splice(i, 1);
						return;
					}
				}
			}
		};
	}