From 3f073056ded3b3f33f9e79283788fd5f15e976e0 Mon Sep 17 00:00:00 2001
From: Martok <martok@martoks-place.de>
Date: Sun, 27 Nov 2022 16:35:46 +0100
Subject: [PATCH] Issue #2030 - Pref-gate default button event dispatch logic

---
 layout/style/res/forms.css  | 10 ++++++++++
 modules/libpref/init/all.js |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/layout/style/res/forms.css b/layout/style/res/forms.css
index a808822c89..fcf5874829 100644
--- a/layout/style/res/forms.css
+++ b/layout/style/res/forms.css
@@ -699,6 +699,16 @@ button {
   justify-items: inherit;
 }
 
+@supports -moz-bool-pref("dom.forms.button.standards_compliant") {
+  /*
+   * Button content does historically not receive pointer events.
+   * This pref is enabled by default and can disabled to get Webkit behavior.
+   */
+  button * {
+    pointer-events: none !important;
+  }
+}
+
 button:hover,
 input[type="color"]:-moz-system-metric(color-picker-available):hover,
 input[type="reset"]:hover,
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index e8419d664b..0ef3903c22 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1198,6 +1198,9 @@ pref("dom.forms.datetime.timepicker", false);
 // TODO: implement/fix these.
 pref("dom.forms.datetime.others", false);
 
+// <button> elements are opaque to pointer events.
+pref("dom.forms.button.standards_compliant", true);
+
 // Support for new @autocomplete values
 pref("dom.forms.autocomplete.experimental", false);