1 files changed, 7 insertions, 1 deletions
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Number.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Number.php
index 8edc159e7..ef49d20fd 100644
--- a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Number.php
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Number.php
@@ -69,7 +69,13 @@ class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
             return false;
         }
 
-        $left = ltrim($left, '0');
+        // Remove leading zeros until positive number or a zero stays left
+        if (ltrim($left, '0') != '') {
+            $left = ltrim($left, '0');
+        } else {
+            $left = '0';
+        }
+
         $right = rtrim($right, '0');
 
         if ($right === '') {