src/vs/editor/browser/config/charWidthReader.ts/DomCharWidthReader/_readFromDomElements
class DomCharWidthReader:	private _readFromDomElements(): void {
		for (let i = 0, len = this._requests.length; i < len; i++) {
			const request = this._requests[i];
			const testElement = this._testElements![i];

			request.fulfill(testElement.offsetWidth / 256);
		}
	}