
PASS Calling document.getElementById with an empty string argument. 
PASS Calling document.getElementById with a null argument. 
PASS Calling document.getElementById with an undefined argument. 
PASS on static page 
PASS Document.getElementById with a script-inserted element 
PASS update `id` attribute via setAttribute/removeAttribute 
PASS Ensure that the id attribute only affects elements present in a document 
PASS in tree order, within the context object's tree 
PASS Modern browsers optimize this method with using internal id cache. This test checks that their optimization should effect only append to `Document`, not append to `Node`. 
PASS changing attribute's value via `Attr` gotten from `Element.attribute`. 
PASS add id attribute via innerHTML 
PASS remove id attribute via innerHTML 
PASS add id attribute via outerHTML 
PASS remove id attribute via outerHTML 
PASS update `id` attribute via element.id 
PASS where insertion order and tree order don't match 
PASS Inserting an id by inserting its parent node 
PASS Document.getElementById must not return nodes not present in document