extensions/emmet/src/reflectCssValue.ts/reflectCssValue
export function reflectCssValue(): Thenable<boolean> | undefined {
	const editor = window.activeTextEditor;
	if (!editor) {
		window.showInformationMessage('No editor is active.');
		return;
	}

	const node = getCssPropertyFromDocument(editor, editor.selection.active);
	if (!node) {
		return;
	}

	return updateCSSNode(editor, node);
}