Update webidl and implement setter for the files property of a file input (#31934)

The files attribute was previously readonly, but was later updated to allow mutation via input.files = ...

see https://github.com/whatwg/html/issues/2861

2 files changed, 8 insertions, 1 deletions

diff --git a/components/script/dom/htmlinputelement.rs b/components/script/dom/htmlinputelement.rs
index b00d2079db6..5ebd9c2cdc0 100755
--- a/components/script/dom/htmlinputelement.rs
+++ b/components/script/dom/htmlinputelement.rs
@@ -1186,6 +1186,13 @@ impl HTMLInputElementMethods for HTMLInputElement {
         self.filelist.get().as_ref().cloned()
     }
 
+    /// <https://html.spec.whatwg.org/multipage/#dom-input-files>
+    fn SetFiles(&self, files: Option<&FileList>) {
+        if self.input_type() == InputType::File && files.is_some() {
+            self.filelist.set(files);
+        }
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-input-defaultchecked
     make_bool_getter!(DefaultChecked, "checked");
 
diff --git a/components/script/dom/webidls/HTMLInputElement.webidl b/components/script/dom/webidls/HTMLInputElement.webidl
index 160b3904439..519198cebd9 100644
--- a/components/script/dom/webidls/HTMLInputElement.webidl
+++ b/components/script/dom/webidls/HTMLInputElement.webidl
@@ -23,7 +23,7 @@ interface HTMLInputElement : HTMLElement {
   [CEReactions]
            attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-  readonly attribute FileList? files;
+  attribute FileList? files;
   [CEReactions]
            attribute DOMString formAction;
   [CEReactions]