Initial accpetance test for Shadow DOM piercing

Author: emanlove

atest/acceptance/locators/piercing_shadowdom.robot

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+*** Settings ***
+Documentation     Tests different supported xpath strategies
+Test Setup        Go To Page "shadow_dom.html"
+Resource          ../resource.robot
+
+*** Test Cases ***
+Multiple Locators with double arrows as separator should work
+    [Setup]    Go To Page "links.html"
+    Page Should Contain Element    css:div#div_id >> xpath:a[6] >> id:image1_id