Question

I read information about method click of interface WebElement, but not clearly understand what mean such statement “If click() causes a new page to be loaded via an event or is done by sending a native event”?

Answer 1

Here is the full javadoc:

Click this element. If this causes a new page to load, this method
will attempt to block until the page has loaded. At this point, you
should discard all references to this element and any further
operations performed on this element will throw a
StaleElementReferenceException unless you know the element and the
page will still be present. If click() causes a new page to be loaded
via an event or is done by sending a native event then the method will
not wait for it to be loaded and the caller should verify that a new page has been loaded.

This means that click() is a blocking call if a new request in the browser is issued. And returns when the page is loaded.

click() is not a blocking call when it executes some javascript that loads the new page (or parts of it) (ajax). In this case you have to use WebDriverWait and wait for some css-classes / ids / text to appear.