Add invoker argument to showPopover() in anchor integration test

Author: fantasai

html/semantics/popovers/popover-alignment-001.html

@@ -21,6 +21,6 @@
 <div id="p1" popover></div>
 
 <script>
-document.querySelector("[popover]").showPopover();
+document.querySelector("[popover]").showPopover({ source: document.querySelector("button") });
 document.documentElement.removeAttribute("class");
 </script>

html/semantics/popovers/popover-alignment-002.html

@@ -21,6 +21,6 @@
 <div id="p3" popover style="position-area: left span-all"></div>
 
 <script>
-document.querySelector("[popover]").showPopover();
+document.querySelector("[popover]").showPopover({ source: document.querySelector("button") });
 document.documentElement.removeAttribute("class");
 </script>