Feature: Get element locator from WebElement

Feature and motivation

Each WebElement must have a By locator that uniquely locates it.
As far as I can tell, the locator is protected and not available.
There are cases when pulling it out and re-using it would be helpful.
I propose exposing a getter for the By locator.

Usage example

You initialize a web element and it eventually becomes stale.
To refresh it, you either need to

• remember the locator and re-load it by calling the locator. Not always possible if you pass the element around
• use the @FindBy annotation so it auto refresh when stale. Can't use that if locators need to have variables.

If I need to check if an element exists

• I used @FindBy, can't do that as it will patiently wait until it times out. Need to do a driver.findElementsBy(locator..).size()>0 , but can't as I can't reach the By to do this. So I copy paste my locator, once in annotation and once as a By in my fields, effectively duplicating code
• if I do the same thing with a webelemennt I previous located, I can at least catch a stale exception and handle that, but would be nicer if I could get the by and fire up findelements to check if it still exists.

What if, instead, we could get the locator from each element. Would help with duplicating locators, as well as constructing new webelements or running the locators against the page again.

Opening after being told on the Selenium issues I should open one for the driver specification instead
https://github.com/SeleniumHQ/selenium/issues/13660

Start with the WebElement and By concepts in the WebDriver specification, then review the linked Selenium issue for the related implementation discussion. Determine whether the specification should expose a locator and define how it is retrieved and reused; the feature is done when that behavior is unambiguous in the specification.