It's benefit to support ElementHandle.waitForSelector method

In browser, we can use querySelector method like this:

const div = document.querySelector('div');  // lookup "div" globally
const span = div.querySelector('span');  // lookup "span" locally, that is bounded to div's scope

It’s helpful to provide waitForSelector method on ElementHandle, thus we can wait for selector locally that is bounded to the ElementHandle instance.

[tanvee38]

Great work by JoelEinbinder and aslushnikov. Eagerly waiting to see the waitFor* functions support to wait for elementHandle in the next Puppeteer release.

[JoelEinbinder]

With 05b1aca21e5c2f221373d601d3b8ae6b2a984292 you should be able to do something like this.

Warning, untested code ahead:

function waitForScopedSelector(selector, scopeElement) {
    return page.waitForFunction((selector, scopeElement) => scopeElement.querySelector(selector), {}, selector, scopeElement);
}