src/vs/editor/browser/config/editorConfiguration.ts/EditorConfiguration/_readEnvConfiguration
class EditorConfiguration:	protected _readEnvConfiguration(): IEnvConfiguration {
		return {
			extraEditorClassName: getExtraEditorClassName(),
			outerWidth: this._containerObserver.getWidth(),
			outerHeight: this._containerObserver.getHeight(),
			emptySelectionClipboard: browser.isWebKit || browser.isFirefox,
			pixelRatio: browser.PixelRatio.value,
			accessibilitySupport: (
				this._accessibilityService.isScreenReaderOptimized()
					? AccessibilitySupport.Enabled
					: this._accessibilityService.getAccessibilitySupport()
			)
		};
	}