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website/node_modules/@base-ui/utils/getDefaultFormSubmitter.mjs

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+/**
+ * Returns the default button a browser uses for implicit form submission.
+ *
+ * This is useful for custom form controls that need to mirror native Enter key behavior.
+ * Clicking the returned submitter preserves browser semantics such as the submitter's click
+ * event, `SubmitEvent.submitter`, and submitter-specific attributes.
+ *
+ * The function follows the controls exposed by `form.elements`, which includes controls associated
+ * through the `form` attribute. Disabled submitters can be returned because the default button is
+ * determined before disabled state is considered; clicking a disabled submitter is a no-op.
+ */
+export function getDefaultFormSubmitter(form) {
+  if (!form) {
+    return null;
+  }
+  for (const candidate of form.elements) {
+    const tagName = candidate.tagName;
+    if (tagName === 'BUTTON' || tagName === 'INPUT') {
+      const button = candidate;
+
+      // Intentionally excludes input[type="image"]: Chromium omits it from form.elements,
+      // so supporting it would require separate traversal for an exotic submitter type.
+      if (button.type === 'submit') {
+        return button;
+      }
+    }
+  }
+  return null;
+}