From 20f1e3c7bcb6f037d20cc2c5eab6799faa292b8e Mon Sep 17 00:00:00 2001
From: Caleb Callaway <cqcallaw@brainvitamins.net>
Date: Sun, 22 Nov 2020 10:45:32 -0800
Subject: [PATCH] Fix percentage validation in CheckLength (#912)

Fixes #910
---
 src/attrs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/attrs.c b/src/attrs.c
index 3eae987..13c2668 100644
--- a/src/attrs.c
+++ b/src/attrs.c
@@ -1856,13 +1856,19 @@ void CheckLength( TidyDocImpl* doc, Node *node, AttVal *attval)
     }
     else
     {
+        Bool percentFound = no;
         while (*p)
         {
-            if (!TY_(IsDigit)(*p) && *p != '%')
+            if (!percentFound && *p == '%')
+            {
+                percentFound = yes;
+            }
+            else if (percentFound || !TY_(IsDigit)(*p))
             {
                 TY_(ReportAttrError)( doc, node, attval, BAD_ATTRIBUTE_VALUE);
                 break;
             }
+
             ++p;
         }
     }