1 files changed, 20 insertions, 0 deletions
diff --git a/dom/html/test/forms/utils.js b/dom/html/test/forms/utils.js
new file mode 100644
index 0000000000..fee762995c
--- /dev/null
+++ b/dom/html/test/forms/utils.js
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+/**
+ * Simulate the user clicks the reset button of the given date or time element.
+ *
+ * @param inputElement A date or time input element of default size.
+ */
+function simulateUserClicksResetButton(inputElement) {
+  var inputRectangle = inputElement.getBoundingClientRect();
+  const offsetX = inputRectangle.width - 15;
+  const offsetY = inputRectangle.height / 2;
+
+  synthesizeMouse(inputElement, offsetX, offsetY, {});
+}
+
+/**
+ * @param navigator https://www.w3schools.com/jsref/obj_navigator.asp.
+ * @return true, iff it's a desktop user agent.
+ */
+function isDesktopUserAgent(navigator) {
+  return !/Mobile|Tablet/.test(navigator.userAgent);
+}