diff --git a/demo/embedded.html b/demo/embedded.html
index 5105339..99fd8d3 100644
--- a/demo/embedded.html
+++ b/demo/embedded.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html>
 <title>OpenSCD Core Embedding Demo</title>
 <iframe src="./index.html?locale=de&dark"></iframe>
 <style>
diff --git a/demo/index.html b/demo/index.html
index 8a248dc..dd24363 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html>
 <title>OpenSCD Core Demo</title>
 <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@300&family=Roboto:wght@300;400;500&display=swap">
 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons&display=block">
diff --git a/screenshots/Firefox/baseline/app-bar-de.png b/screenshots/Firefox/baseline/app-bar-de.png
index 117aa57..6895986 100644
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diff --git a/screenshots/Firefox/baseline/app-bar-en.png b/screenshots/Firefox/baseline/app-bar-en.png
index 117aa57..6895986 100644
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diff --git a/screenshots/Firefox/baseline/document-name-de.png b/screenshots/Firefox/baseline/document-name-de.png
index 14835fd..21baee4 100644
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index 14835fd..21baee4 100644
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diff --git a/screenshots/Firefox/baseline/editor-plugins-de.png b/screenshots/Firefox/baseline/editor-plugins-de.png
index df2e7a2..400fdcb 100644
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index 9a6a5e5..8763717 100644
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diff --git a/screenshots/Firefox/baseline/editor-plugins-selected-de.png b/screenshots/Firefox/baseline/editor-plugins-selected-de.png
index 6272861..2a65d60 100644
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index c9fb1d9..9b7193d 100644
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diff --git a/screenshots/Firefox/baseline/editor-plugins-with-doc-de.png b/screenshots/Firefox/baseline/editor-plugins-with-doc-de.png
index c7afb13..fbd2ddd 100644
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index 57b0fed..b868ae5 100644
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diff --git a/screenshots/Firefox/baseline/log-entries-de.png b/screenshots/Firefox/baseline/log-entries-de.png
index 14c83c9..1e18aca 100644
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index 09b61f5..39d18be 100644
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diff --git a/screenshots/Firefox/baseline/log-entries-redone-de.png b/screenshots/Firefox/baseline/log-entries-redone-de.png
index dd5fb82..4428e86 100644
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index 1771821..34a2450 100644
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index f2304cd..b4035f7 100644
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diff --git a/screenshots/Firefox/baseline/log-screen-de.png b/screenshots/Firefox/baseline/log-screen-de.png
index 19897f4..d294a5a 100644
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index 2ebad74..29a6254 100644
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diff --git a/screenshots/Firefox/baseline/menu-drawer-de.png b/screenshots/Firefox/baseline/menu-drawer-de.png
index 89482f1..1d69d19 100644
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index 9e7f729..cb27092 100644
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diff --git a/screenshots/Firefox/baseline/menu-plugins-de.png b/screenshots/Firefox/baseline/menu-plugins-de.png
index ca0a77a..ca24293 100644
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diff --git a/screenshots/Firefox/baseline/menu-plugins-en.png b/screenshots/Firefox/baseline/menu-plugins-en.png
index ccfbbd8..5fd6d12 100644
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diff --git a/screenshots/Firefox/baseline/menu-plugins-triggered-de.png b/screenshots/Firefox/baseline/menu-plugins-triggered-de.png
index 0b55db5..fe198c3 100644
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diff --git a/screenshots/Firefox/baseline/menu-plugins-triggered-en.png b/screenshots/Firefox/baseline/menu-plugins-triggered-en.png
index 4c776f9..aeddca0 100644
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diff --git a/web-test-runner.config.js b/web-test-runner.config.js
index a88fa3d..15a0dad 100644
--- a/web-test-runner.config.js
+++ b/web-test-runner.config.js
@@ -77,6 +77,7 @@ export default /** @type {import("@web/test-runner").TestRunnerConfig} */ ({
       name: 'visual',
       files: 'dist/**/*.test.js',
       testRunnerHtml: testFramework => `
+<!DOCTYPE html>
 <html>
   <head>
     <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@300&family=Roboto:wght@300;400;500&display=swap">
@@ -124,6 +125,8 @@ export default /** @type {import("@web/test-runner").TestRunnerConfig} */ ({
 
     body {
       background: white;
+      width: 100vw;
+      height: 100vh;
     }
     </style>
   </body>
