add Page.Wait method

[storyicon]

Wait method will cause the browser to spend up to timeout seconds
waiting for the element described by the selector to appear.
Method for testing or crawling Javascript-modified web pages (eg Ajax)
Simple example:
page.Wait(//*[@id="ajax-loaded"], 30)
fmt.Println(page.HTML())

[sclevine]

Sorry for the delay!

I think this can be accomplished via the webdriver with page.SetImplicitWait:
https://godoc.org/github.com/sclevine/agouti#Page.SetImplicitWait

That said, I'd consider merging a tested version of this implemented on the Selection or MultiSelection types.

[storyicon]

I think there is some difference between page.Wait() and page.SetImplicitWait(). page.Wait() is used to block the process and wait for an element to appear. If it does not appear before timeout, it will unblock and return nil.
I am very happy to hear from you because I am a user of agouti and I think it is better than chromedp/chromedp. I once thought that you have given up the maintenance of agouti.