From fc0534ea26bfecc6fecc0e0a75104dc39d5a86f1 Mon Sep 17 00:00:00 2001
From: Keith Cirkel <keithamus@users.noreply.github.com>
Date: Wed, 13 May 2026 09:43:01 +0100
Subject: [PATCH] ensure mode is always set to INITIAL during startTokenization

While currently, all branches set a mode, this is both subtle and fragile; if a
branch ends up not setting mode it will never be reset. This means
subsequent calls to start tokenisation can end up with a different
initial mode.

This change simply resets mode to INITIAL on every startTokenization() call,
ensuring that if we ever miss it, it will be reset.
---
 src/nu/validator/htmlparser/impl/TreeBuilder.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/nu/validator/htmlparser/impl/TreeBuilder.java b/src/nu/validator/htmlparser/impl/TreeBuilder.java
index e17c3a04..f2d92592 100644
--- a/src/nu/validator/htmlparser/impl/TreeBuilder.java
+++ b/src/nu/validator/htmlparser/impl/TreeBuilder.java
@@ -592,6 +592,7 @@ public boolean dropBufferIfLongerThan(int length) {
         templateModeStack = new int[64];
         listOfActiveFormattingElements = new StackNode[64];
         needToDropLF = false;
+        mode = INITIAL;
         originalMode = INITIAL;
         templateModePtr = -1;
         stackNodesIdx = 0;