Use a specified value

Author: eps1lon

fixtures/attribute-behavior/AttributeTableSnapshot.md

@@ -4826,9 +4826,9 @@
 ## `hidden` (on `<div>` inside `<div>`)
 | Test Case | Flags | Result |
 | --- | --- | --- |
-| `hidden=(string)`| (changed)| `<boolean: true>` |
+| `hidden=(string)`| (changed)| `"until-found"` |
 | `hidden=(empty string)`| (changed)| `<boolean: true>` |
-| `hidden=(array with string)`| (changed)| `<boolean: true>` |
+| `hidden=(array with string)`| (changed)| `"until-found"` |
 | `hidden=(empty array)`| (changed)| `<boolean: true>` |
 | `hidden=(object)`| (changed)| `<boolean: true>` |
 | `hidden=(numeric string)`| (changed)| `<boolean: true>` |

fixtures/attribute-behavior/src/attributes.js

@@ -887,7 +887,7 @@ const attributes = [
     read: getSVGProperty('height'),
     overrideStringValue: '100%',
   },
-  {name: 'hidden'},
+  {name: 'hidden', overrideStringValue: 'until-found'},
   {name: 'high', tagName: 'meter'},
   {
     name: 'horiz-adv-x',