| 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 | |