get_value method
Implementation
Future<String?> get_value(AbstractSelector selector, String property) async {
Show.action('getting', property, 'of', selector.selector);
await (await page).waitForSelector(selector.selector);
var value = await (await page).evaluate('''(selector, property) => {
return document.querySelector(selector).$property;
}''', args: [selector.selector, property]);
return value;
}