1 files changed, 18 insertions, 0 deletions
diff --git a/misc/drupal.js b/misc/drupal.js
index d6f7597c3..9d7ec8089 100644
--- a/misc/drupal.js
+++ b/misc/drupal.js
@@ -300,6 +300,24 @@ Drupal.getSelection = function (element) {
 };
 
 /**
+ * Checks if position:fixed is supported.
+ *
+ * @return
+ *   Boolean indicating whether or not position:fixed is supported.
+ *
+ * @see http://yura.thinkweb2.com/cft/#IS_POSITION_FIXED_SUPPORTED
+ */
+Drupal.positionFixedSupported = function () {
+  if (this._positionFixedSupported === undefined) {
+    var el = $('<div style="position:fixed; top:10px" />').appendTo(document.body);
+    this._positionFixedSupported = el[0].offsetTop === 10;
+    el.remove();
+  }
+
+  return this._positionFixedSupported;
+};
+
+/**
  * Build an error message from an AJAX response.
  */
 Drupal.ajaxError = function (xmlhttp, uri) {