[Editor] Add an aria label to an added signature (bug 1952571)

src/display/editor/signature.js

@@ -259,6 +259,7 @@ class SignatureEditor extends DrawingEditor {
     const { outline } = (this.#signatureData = data);
     this.#isExtracted = outline instanceof ContourDrawOutline;
     this.#description = description;
+    this.div.setAttribute("aria-label", description);
     let drawingOptions;
     if (this.#isExtracted) {
       drawingOptions = SignatureEditor.getDefaultDrawingOptions();

test/integration/signature_editor_spec.mjs

@@ -182,6 +182,11 @@ describe("Signature Editor", () => {
             `.altText.editDescription[title="Hello World"]`
           );
 
+          // Check the aria label.
+          await page.waitForSelector(
+            `${editorSelector}[aria-label="Hello World"]`
+          );
+
           // Edit the description.
           await page.click(`.altText.editDescription`);