From d964c50cff5e36c251ff5077066069c66ffc1086 Mon Sep 17 00:00:00 2001
From: Sam Rawlins <srawlins@google.com>
Date: Fri, 6 Sep 2019 18:31:59 +0000
Subject: [PATCH] clear contents on TemplateElement#setInnerHtml before
 appending

Fixes #18249

Change-Id: I29b12163ad5809010c4ee4ff4ce892399d26e3ea
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/112485
Reviewed-by: Terry Lucas <terry@google.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>
---
 sdk/lib/html/dart2js/html_dart2js.dart                         | 3 ++-
 .../templates/html/impl/impl_HTMLTemplateElement.darttemplate  | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 0736e0643aafe..303ec9e4fad43 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -28281,11 +28281,12 @@ class TemplateElement extends HtmlElement {
    *
    * See also:
    *
-   * * <https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#innerhtml-on-templates>
+   * * <https://w3c.github.io/DOM-Parsing/#the-innerhtml-mixin>
    */
   void setInnerHtml(String html,
       {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
     text = null;
+    content.nodes.clear();
     var fragment = createFragment(html,
         validator: validator, treeSanitizer: treeSanitizer);
 
diff --git a/tools/dom/templates/html/impl/impl_HTMLTemplateElement.darttemplate b/tools/dom/templates/html/impl/impl_HTMLTemplateElement.darttemplate
index f37da9680dc2a..7fb61fe381a0f 100644
--- a/tools/dom/templates/html/impl/impl_HTMLTemplateElement.darttemplate
+++ b/tools/dom/templates/html/impl/impl_HTMLTemplateElement.darttemplate
@@ -14,11 +14,12 @@ $!MEMBERS
    *
    * See also:
    *
-   * * <https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#innerhtml-on-templates>
+   * * <https://w3c.github.io/DOM-Parsing/#the-innerhtml-mixin>
    */
   void setInnerHtml(String html,
     {NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
     text = null;
+    content.nodes.clear();
     var fragment = createFragment(
         html, validator: validator, treeSanitizer: treeSanitizer);