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index 3e64774523c..9a54a12cd4d 100644
--- a/adev/src/content/examples/angular-compiler-options/src/index.html
+++ b/adev/src/content/examples/angular-compiler-options/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
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index 69b087bb7f5..833b4414bfb 100644
--- a/adev/src/content/examples/attribute-binding/src/index.html
+++ b/adev/src/content/examples/attribute-binding/src/index.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/bootstrapping/src/index.html b/adev/src/content/examples/bootstrapping/src/index.html
index d87141cefbd..6dd1234dd1e 100644
--- a/adev/src/content/examples/bootstrapping/src/index.html
+++ b/adev/src/content/examples/bootstrapping/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/built-in-directives/src/index.html b/adev/src/content/examples/built-in-directives/src/index.html
index a64221422fa..543813ff01b 100644
--- a/adev/src/content/examples/built-in-directives/src/index.html
+++ b/adev/src/content/examples/built-in-directives/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/built-in-template-functions/src/index.html b/adev/src/content/examples/built-in-template-functions/src/index.html
index 3d0694ea206..55b10c2347a 100644
--- a/adev/src/content/examples/built-in-template-functions/src/index.html
+++ b/adev/src/content/examples/built-in-template-functions/src/index.html
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-<!doctype html>
+<!DOCTYPE html>
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 <head>
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diff --git a/adev/src/content/examples/component-overview/src/index.html b/adev/src/content/examples/component-overview/src/index.html
index 743fd8d693a..4d595040b0b 100644
--- a/adev/src/content/examples/component-overview/src/index.html
+++ b/adev/src/content/examples/component-overview/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
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diff --git a/adev/src/content/examples/content-projection/src/index.html b/adev/src/content/examples/content-projection/src/index.html
index 37a08c91695..e70cad4e122 100644
--- a/adev/src/content/examples/content-projection/src/index.html
+++ b/adev/src/content/examples/content-projection/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/event-binding/src/index.html b/adev/src/content/examples/event-binding/src/index.html
index a5478df7c35..5c13ab5c54f 100644
--- a/adev/src/content/examples/event-binding/src/index.html
+++ b/adev/src/content/examples/event-binding/src/index.html
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+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/feature-modules/src/index.html b/adev/src/content/examples/feature-modules/src/index.html
index 501d9f8401e..20a97247370 100644
--- a/adev/src/content/examples/feature-modules/src/index.html
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@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/forms-overview/src/index.html b/adev/src/content/examples/forms-overview/src/index.html
index 1b7ce5d62c4..988ae05585c 100644
--- a/adev/src/content/examples/forms-overview/src/index.html
+++ b/adev/src/content/examples/forms-overview/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/inputs-outputs/src/index.html b/adev/src/content/examples/inputs-outputs/src/index.html
index 0a29ec3bee9..5a9d089e689 100644
--- a/adev/src/content/examples/inputs-outputs/src/index.html
+++ b/adev/src/content/examples/inputs-outputs/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/interpolation/src/index.html b/adev/src/content/examples/interpolation/src/index.html
index f04d76310c3..9ee2030b3f9 100644
--- a/adev/src/content/examples/interpolation/src/index.html
+++ b/adev/src/content/examples/interpolation/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/lazy-loading-ngmodules/src/index.html b/adev/src/content/examples/lazy-loading-ngmodules/src/index.html
index e4649cbbf51..36a38d88e65 100644
--- a/adev/src/content/examples/lazy-loading-ngmodules/src/index.html
+++ b/adev/src/content/examples/lazy-loading-ngmodules/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
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diff --git a/adev/src/content/examples/ngmodules/src/index.html b/adev/src/content/examples/ngmodules/src/index.html
index f350d3c61dd..eed605031d6 100644
--- a/adev/src/content/examples/ngmodules/src/index.html
+++ b/adev/src/content/examples/ngmodules/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/property-binding/src/index.html b/adev/src/content/examples/property-binding/src/index.html
index 439ddfc7bf1..1e94efa11b9 100644
--- a/adev/src/content/examples/property-binding/src/index.html
+++ b/adev/src/content/examples/property-binding/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
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diff --git a/adev/src/content/examples/providers-viewproviders/src/index.html b/adev/src/content/examples/providers-viewproviders/src/index.html
index db568a81df9..f236ae2204b 100644
--- a/adev/src/content/examples/providers-viewproviders/src/index.html
+++ b/adev/src/content/examples/providers-viewproviders/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/resolution-modifiers/src/index.html b/adev/src/content/examples/resolution-modifiers/src/index.html
index 5be77567b29..4ec849ae7c0 100644
--- a/adev/src/content/examples/resolution-modifiers/src/index.html
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@@ -1,4 +1,4 @@
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+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/router-tutorial/src/index.html b/adev/src/content/examples/router-tutorial/src/index.html
index 2f1d7fa27c4..edfa60e4c97 100644
--- a/adev/src/content/examples/router-tutorial/src/index.html
+++ b/adev/src/content/examples/router-tutorial/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/schematics-for-libraries/src/index.html b/adev/src/content/examples/schematics-for-libraries/src/index.html
index bfa7240ace3..e2eadbd1aed 100644
--- a/adev/src/content/examples/schematics-for-libraries/src/index.html
+++ b/adev/src/content/examples/schematics-for-libraries/src/index.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/service-worker-getting-started/src/index.html b/adev/src/content/examples/service-worker-getting-started/src/index.html
index c3066538b75..9b548d69464 100755
--- a/adev/src/content/examples/service-worker-getting-started/src/index.html
+++ b/adev/src/content/examples/service-worker-getting-started/src/index.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/ssr/src/index.html b/adev/src/content/examples/ssr/src/index.html
index 0e589b12384..5ddce3f5eb3 100644
--- a/adev/src/content/examples/ssr/src/index.html
+++ b/adev/src/content/examples/ssr/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/template-reference-variables/src/index.html b/adev/src/content/examples/template-reference-variables/src/index.html
index c577a79c944..679d64c77fe 100644
--- a/adev/src/content/examples/template-reference-variables/src/index.html
+++ b/adev/src/content/examples/template-reference-variables/src/index.html
@@ -1,4 +1,4 @@
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+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/testing/src/index.html b/adev/src/content/examples/testing/src/index.html
index 4106cb2d82e..8c6b39bc96a 100644
--- a/adev/src/content/examples/testing/src/index.html
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-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
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diff --git a/adev/src/content/examples/two-way-binding/src/index.html b/adev/src/content/examples/two-way-binding/src/index.html
index 17601cf77ff..04db6d5de59 100644
--- a/adev/src/content/examples/two-way-binding/src/index.html
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@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/upgrade-lazy-load-ajs/src/index.html b/adev/src/content/examples/upgrade-lazy-load-ajs/src/index.html
index 0552752e108..613deae245e 100644
--- a/adev/src/content/examples/upgrade-lazy-load-ajs/src/index.html
+++ b/adev/src/content/examples/upgrade-lazy-load-ajs/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/upgrade-module/src/index-a-to-ajs-transclusion.html b/adev/src/content/examples/upgrade-module/src/index-a-to-ajs-transclusion.html
index 9a03da2748f..e10f16cb71f 100644
--- a/adev/src/content/examples/upgrade-module/src/index-a-to-ajs-transclusion.html
+++ b/adev/src/content/examples/upgrade-module/src/index-a-to-ajs-transclusion.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-module/src/index-ajs-a-hybrid-bootstrap.html b/adev/src/content/examples/upgrade-module/src/index-ajs-a-hybrid-bootstrap.html
index f00aaf722ff..9a1f492c0e0 100644
--- a/adev/src/content/examples/upgrade-module/src/index-ajs-a-hybrid-bootstrap.html
+++ b/adev/src/content/examples/upgrade-module/src/index-ajs-a-hybrid-bootstrap.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-projection.html b/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-projection.html
index 4ce22ee94f0..407ee09336e 100644
--- a/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-projection.html
+++ b/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-projection.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-providers.html b/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-providers.html
index c545edf8e65..daf9b1557cc 100644
--- a/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-providers.html
+++ b/adev/src/content/examples/upgrade-module/src/index-ajs-to-a-providers.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-module/src/index-bootstrap.html b/adev/src/content/examples/upgrade-module/src/index-bootstrap.html
index 8d9534f95cd..81a1d896425 100644
--- a/adev/src/content/examples/upgrade-module/src/index-bootstrap.html
+++ b/adev/src/content/examples/upgrade-module/src/index-bootstrap.html
@@ -1,5 +1,5 @@
 <!-- #docregion -->
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <base href="/">
diff --git a/adev/src/content/examples/upgrade-module/src/index-downgrade-io.html b/adev/src/content/examples/upgrade-module/src/index-downgrade-io.html
index 48956abdf41..2404725ccc1 100644
--- a/adev/src/content/examples/upgrade-module/src/index-downgrade-io.html
+++ b/adev/src/content/examples/upgrade-module/src/index-downgrade-io.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-module/src/index-downgrade-static.html b/adev/src/content/examples/upgrade-module/src/index-downgrade-static.html
index 7b68bc1cbaf..31b8f3b6b71 100644
--- a/adev/src/content/examples/upgrade-module/src/index-downgrade-static.html
+++ b/adev/src/content/examples/upgrade-module/src/index-downgrade-static.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-module/src/index-ng-app.html b/adev/src/content/examples/upgrade-module/src/index-ng-app.html
index 3bf6233bebc..da329d92f38 100644
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+++ b/adev/src/content/examples/upgrade-module/src/index-ng-app.html
@@ -1,5 +1,5 @@
 <!-- #docregion -->
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <base href="/">
diff --git a/adev/src/content/examples/upgrade-module/src/index-upgrade-io.html b/adev/src/content/examples/upgrade-module/src/index-upgrade-io.html
index e57a05bac20..308b9257a70 100644
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+++ b/adev/src/content/examples/upgrade-module/src/index-upgrade-io.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-module/src/index-upgrade-static.html b/adev/src/content/examples/upgrade-module/src/index-upgrade-static.html
index 74461d9ce25..80b1772381a 100644
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+++ b/adev/src/content/examples/upgrade-module/src/index-upgrade-static.html
@@ -1,4 +1,4 @@
-<!DOCTYPE HTML>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <title>Angular Upgrade</title>
diff --git a/adev/src/content/examples/upgrade-phonecat-1-typescript/app/index.html b/adev/src/content/examples/upgrade-phonecat-1-typescript/app/index.html
index 82717fb7ee9..5bc41e05965 100644
--- a/adev/src/content/examples/upgrade-phonecat-1-typescript/app/index.html
+++ b/adev/src/content/examples/upgrade-phonecat-1-typescript/app/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en" ng-app="phonecatApp">
   <head>
     <meta charset="utf-8">
diff --git a/adev/src/content/examples/upgrade-phonecat-2-hybrid/aot/index.html b/adev/src/content/examples/upgrade-phonecat-2-hybrid/aot/index.html
index a051e91e8d4..bb1b915eeb2 100644
--- a/adev/src/content/examples/upgrade-phonecat-2-hybrid/aot/index.html
+++ b/adev/src/content/examples/upgrade-phonecat-2-hybrid/aot/index.html
@@ -1,5 +1,5 @@
 <!-- #docregion -->
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="utf-8">
diff --git a/adev/src/content/examples/upgrade-phonecat-2-hybrid/index.html b/adev/src/content/examples/upgrade-phonecat-2-hybrid/index.html
index f313fb2855a..490880f7e84 100644
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+++ b/adev/src/content/examples/upgrade-phonecat-2-hybrid/index.html
@@ -1,5 +1,5 @@
 <!-- #docplaster -->
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="utf-8">
diff --git a/adev/src/content/examples/upgrade-phonecat-3-final/index.html b/adev/src/content/examples/upgrade-phonecat-3-final/index.html
index 012b5a1ebee..cab6491c407 100644
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+++ b/adev/src/content/examples/upgrade-phonecat-3-final/index.html
@@ -1,6 +1,6 @@
 <!-- #docplaster -->
 <!-- #docregion full -->
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="utf-8">
diff --git a/adev/src/content/examples/view-encapsulation/src/index.html b/adev/src/content/examples/view-encapsulation/src/index.html
index 3e64774523c..9a54a12cd4d 100644
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+++ b/adev/src/content/examples/view-encapsulation/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/examples/what-is-angular/src/index.html b/adev/src/content/examples/what-is-angular/src/index.html
index b97ce83cc46..77e13e5febf 100644
--- a/adev/src/content/examples/what-is-angular/src/index.html
+++ b/adev/src/content/examples/what-is-angular/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/tutorials/first-app/steps/01-hello-world/src/index.html b/adev/src/content/tutorials/first-app/steps/01-hello-world/src/index.html
index 1cb85d1fa5a..fb82dcc0fd8 100644
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@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/tutorials/first-app/steps/02-HomeComponent/src/index.html b/adev/src/content/tutorials/first-app/steps/02-HomeComponent/src/index.html
index fd914e8d93e..b8658772264 100644
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@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/tutorials/first-app/steps/03-HousingLocation/src/index.html b/adev/src/content/tutorials/first-app/steps/03-HousingLocation/src/index.html
index fd914e8d93e..b8658772264 100644
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-<!doctype html>
+<!DOCTYPE html>
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diff --git a/adev/src/content/tutorials/first-app/steps/04-interfaces/src/index.html b/adev/src/content/tutorials/first-app/steps/04-interfaces/src/index.html
index fd914e8d93e..b8658772264 100644
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+<!DOCTYPE html>
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diff --git a/adev/src/content/tutorials/first-app/steps/05-inputs/src/index.html b/adev/src/content/tutorials/first-app/steps/05-inputs/src/index.html
index fd914e8d93e..b8658772264 100644
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 <html lang="en">
 
 <head>
diff --git a/integration/ng_elements/src/slots.html b/integration/ng_elements/src/slots.html
index 5dde1c91bd1..b03741ba879 100644
--- a/integration/ng_elements/src/slots.html
+++ b/integration/ng_elements/src/slots.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
 
 <head>
diff --git a/integration/ng_update_migrations/src/index.html b/integration/ng_update_migrations/src/index.html
index e7d10b9a4f8..43762c8245d 100644
--- a/integration/ng_update_migrations/src/index.html
+++ b/integration/ng_update_migrations/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
   <meta charset="utf-8">
diff --git a/integration/platform-server/projects/ngmodule/src/index.html b/integration/platform-server/projects/ngmodule/src/index.html
index f3c300cf5dd..64525c0d776 100644
--- a/integration/platform-server/projects/ngmodule/src/index.html
+++ b/integration/platform-server/projects/ngmodule/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
   <meta charset="utf-8">
diff --git a/integration/platform-server/projects/standalone/src/index.html b/integration/platform-server/projects/standalone/src/index.html
index f3c300cf5dd..64525c0d776 100644
--- a/integration/platform-server/projects/standalone/src/index.html
+++ b/integration/platform-server/projects/standalone/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
   <meta charset="utf-8">
diff --git a/integration/standalone-bootstrap/src/index.html b/integration/standalone-bootstrap/src/index.html
index 35f9d13f2ea..4a6f5b6cdcd 100644
--- a/integration/standalone-bootstrap/src/index.html
+++ b/integration/standalone-bootstrap/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
   <meta charset="utf-8">
diff --git a/integration/trusted-types/src/index.html b/integration/trusted-types/src/index.html
index 21b3e70df96..54b1122e3b7 100644
--- a/integration/trusted-types/src/index.html
+++ b/integration/trusted-types/src/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
   <meta charset="utf-8">
diff --git a/modules/benchmarks/src/ng_template_outlet_context/ng2/index.html b/modules/benchmarks/src/ng_template_outlet_context/ng2/index.html
index 206f7b0e568..c50a5384880 100644
--- a/modules/benchmarks/src/ng_template_outlet_context/ng2/index.html
+++ b/modules/benchmarks/src/ng_template_outlet_context/ng2/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
   <head>
     <!-- Prevent the browser from requesting any favicon. -->
diff --git a/modules/playground/src/benchpress/index.html b/modules/playground/src/benchpress/index.html
index 1ca2cddef8d..8dc511b5f32 100644
--- a/modules/playground/src/benchpress/index.html
+++ b/modules/playground/src/benchpress/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
 <head>
   <title>Benchpress test</title>
diff --git a/modules/playground/src/todo/index.html b/modules/playground/src/todo/index.html
index cc635a0b525..dd49598de7a 100644
--- a/modules/playground/src/todo/index.html
+++ b/modules/playground/src/todo/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <base>
   <title>Todo Angular</title>
   <link rel="stylesheet" href="css/main.css" media="screen" title="no title" charset="utf-8">
diff --git a/packages/compiler/test/ml_parser/lexer_spec.ts b/packages/compiler/test/ml_parser/lexer_spec.ts
index b345adc5452..14ac1b6f1c7 100644
--- a/packages/compiler/test/ml_parser/lexer_spec.ts
+++ b/packages/compiler/test/ml_parser/lexer_spec.ts
@@ -140,15 +140,15 @@ describe('HtmlLexer', () => {
 
   describe('doctype', () => {
     it('should parse doctypes', () => {
-      expect(tokenizeAndHumanizeParts('<!doctype html>')).toEqual([
-        [TokenType.DOC_TYPE, 'doctype html'],
+      expect(tokenizeAndHumanizeParts('<!DOCTYPE html>')).toEqual([
+        [TokenType.DOC_TYPE, 'DOCTYPE html'],
         [TokenType.EOF],
       ]);
     });
 
     it('should store the locations', () => {
-      expect(tokenizeAndHumanizeSourceSpans('<!doctype html>')).toEqual([
-        [TokenType.DOC_TYPE, '<!doctype html>'],
+      expect(tokenizeAndHumanizeSourceSpans('<!DOCTYPE html>')).toEqual([
+        [TokenType.DOC_TYPE, '<!DOCTYPE html>'],
         [TokenType.EOF, ''],
       ]);
     });
diff --git a/packages/core/test/bundling/animations-standalone/index.html b/packages/core/test/bundling/animations-standalone/index.html
index d437f8b7050..9de92cb96cc 100644
--- a/packages/core/test/bundling/animations-standalone/index.html
+++ b/packages/core/test/bundling/animations-standalone/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
 
diff --git a/packages/core/test/bundling/animations/index.html b/packages/core/test/bundling/animations/index.html
index d437f8b7050..9de92cb96cc 100644
--- a/packages/core/test/bundling/animations/index.html
+++ b/packages/core/test/bundling/animations/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
 
diff --git a/packages/core/test/bundling/cyclic_import/index.html b/packages/core/test/bundling/cyclic_import/index.html
index ac00fb06c57..9cdc165a0a7 100644
--- a/packages/core/test/bundling/cyclic_import/index.html
+++ b/packages/core/test/bundling/cyclic_import/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
 
diff --git a/packages/core/test/bundling/defer/index.html b/packages/core/test/bundling/defer/index.html
index 787c27af425..180fb3463d2 100644
--- a/packages/core/test/bundling/defer/index.html
+++ b/packages/core/test/bundling/defer/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/forms_reactive/index.html b/packages/core/test/bundling/forms_reactive/index.html
index 1329c19373b..dfdf19f0c2e 100644
--- a/packages/core/test/bundling/forms_reactive/index.html
+++ b/packages/core/test/bundling/forms_reactive/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/forms_template_driven/index.html b/packages/core/test/bundling/forms_template_driven/index.html
index ad8ec45b22c..bb4954e4cb9 100644
--- a/packages/core/test/bundling/forms_template_driven/index.html
+++ b/packages/core/test/bundling/forms_template_driven/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/hello_world/index.html b/packages/core/test/bundling/hello_world/index.html
index 1db563b4acf..a976114c839 100644
--- a/packages/core/test/bundling/hello_world/index.html
+++ b/packages/core/test/bundling/hello_world/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/hello_world_i18n/index.html b/packages/core/test/bundling/hello_world_i18n/index.html
index 1de60473e69..bd1b1611189 100644
--- a/packages/core/test/bundling/hello_world_i18n/index.html
+++ b/packages/core/test/bundling/hello_world_i18n/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/hydration/index.html b/packages/core/test/bundling/hydration/index.html
index 1db563b4acf..a976114c839 100644
--- a/packages/core/test/bundling/hydration/index.html
+++ b/packages/core/test/bundling/hydration/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/image-directive/index.html b/packages/core/test/bundling/image-directive/index.html
index 4d49a695509..5334961d866 100644
--- a/packages/core/test/bundling/image-directive/index.html
+++ b/packages/core/test/bundling/image-directive/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/standalone_bootstrap/index.html b/packages/core/test/bundling/standalone_bootstrap/index.html
index 1db563b4acf..a976114c839 100644
--- a/packages/core/test/bundling/standalone_bootstrap/index.html
+++ b/packages/core/test/bundling/standalone_bootstrap/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
   <head>
diff --git a/packages/core/test/bundling/todo_i18n/index.html b/packages/core/test/bundling/todo_i18n/index.html
index a2f05e408b9..b4c5b097ca5 100644
--- a/packages/core/test/bundling/todo_i18n/index.html
+++ b/packages/core/test/bundling/todo_i18n/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 
 <html>
 
diff --git a/packages/core/test/playground/zone-signal-input/index.html b/packages/core/test/playground/zone-signal-input/index.html
index eaf7de691b7..dbebe3f0b46 100644
--- a/packages/core/test/playground/zone-signal-input/index.html
+++ b/packages/core/test/playground/zone-signal-input/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
diff --git a/packages/zone.js/example/basic.html b/packages/zone.js/example/basic.html
index 7ea039f87f1..6a8c0dd4ea8 100644
--- a/packages/zone.js/example/basic.html
+++ b/packages/zone.js/example/basic.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
 <head>
   <meta charset="utf-8">
diff --git a/packages/zone.js/example/benchmarks/addEventListener.html b/packages/zone.js/example/benchmarks/addEventListener.html
index caeba8b07ab..050888a2556 100644
--- a/packages/zone.js/example/benchmarks/addEventListener.html
+++ b/packages/zone.js/example/benchmarks/addEventListener.html
@@ -1,5 +1,5 @@
-<!doctype html>
-<html lang="en">
+<!DOCTYPE html>
+<html>
 <head>
   <meta charset="utf-8">
   <title>Zone.js addEventListenerBenchmark</title>
diff --git a/packages/zone.js/example/counting.html b/packages/zone.js/example/counting.html
index 2c6fe34f0e8..839b8fd796a 100644
--- a/packages/zone.js/example/counting.html
+++ b/packages/zone.js/example/counting.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
   <meta charset="utf-8">
diff --git a/packages/zone.js/example/index.html b/packages/zone.js/example/index.html
index 12f1cf8c50b..7fbea11508e 100644
--- a/packages/zone.js/example/index.html
+++ b/packages/zone.js/example/index.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
 <head>
   <meta charset="utf-8">
diff --git a/packages/zone.js/example/profiling.html b/packages/zone.js/example/profiling.html
index 5224c26151c..4a097c9aeb5 100644
--- a/packages/zone.js/example/profiling.html
+++ b/packages/zone.js/example/profiling.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
 <head>
   <meta charset="utf-8">
diff --git a/packages/zone.js/example/throttle.html b/packages/zone.js/example/throttle.html
index 9dc4f61f085..69f29537ea0 100644
--- a/packages/zone.js/example/throttle.html
+++ b/packages/zone.js/example/throttle.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
 <head>
   <meta charset="utf-8">
diff --git a/packages/zone.js/example/web-socket.html b/packages/zone.js/example/web-socket.html
index 933bab25697..76a40cbb11f 100644
--- a/packages/zone.js/example/web-socket.html
+++ b/packages/zone.js/example/web-socket.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
 <head>
   <meta charset="utf-8">