'Simulates a mouse down event on a link.
Key attributes for links are `id`, `name`, `href` and link text. See
`introduction` for details about locating elements.'

@keyword
def mouse_down_on_link(self, locator):

    element = self.find_element(locator, tag='link')
    action = ActionChains(self.browser)
    action.click_and_hold(element).perform()
