diff --git a/uppsrc/Skylark/srcdoc.tpp/Tutorial$en-us.tpp b/uppsrc/Skylark/srcdoc.tpp/Tutorial$en-us.tpp
index 609a45902..fbbe8456a 100644
--- a/uppsrc/Skylark/srcdoc.tpp/Tutorial$en-us.tpp
+++ b/uppsrc/Skylark/srcdoc.tpp/Tutorial$en-us.tpp
@@ -33,17 +33,18 @@ response to various HTTP requests based on url pattern:&]
 [s7; &]
 [s7; [* SKYLARK](HomePage, `"`")&]
 [s7; `{&]
-[s7; -|http << `"<html><body>Hello world!</body></html>`";&]
+[s7; -|http << `"<!DOCTYPE html><html><body>Hello world!</body></html>`";&]
 [s7; `}&]
 [s7; &]
 [s7; [* SKYLARK](Param, `"`*/param`")&]
 [s7; `{&]
-[s7; -|http << `"<html><body>Parameter: `" << http`[0`] << `"</html></body>`";&]
+[s7; -|http << `"<!DOCTYPE html><html><body>Parameter: `" << http`[0`] 
+<< `"</html></body>`";&]
 [s7; `}&]
 [s7; &]
 [s7; [* SKYLARK](Params, `"params/`*`*`")&]
 [s7; `{&]
-[s7; -|http << `"<html><body>Parameters: `";&]
+[s7; -|http << `"<!DOCTYPE html><html><body>Parameters: `";&]
 [s7; -|for(int i `= 0; i < http.GetParamCount(); i`+`+)&]
 [s7; -|-|http << http`[i`] << `" `";&]
 [s7; -|http << `"</html></body>`";&]
@@ -168,6 +169,7 @@ features template language `'Witz`':&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark02/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; MyValue: [* `$MyValue]<br>&]
@@ -251,6 +253,7 @@ passed as argument of the function:&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark03/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <a href`=[* `$Page2]>Link to page2</a><br>&]
@@ -261,6 +264,7 @@ passed as argument of the function:&]
 [s7; </html>&]
 [s7; &]
 [s5; [* Skylark03/page2.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <a href`=[* `$HomePage()]>Back to index</a><br>&]
@@ -268,6 +272,7 @@ passed as argument of the function:&]
 [s7; </html>&]
 [s7; &]
 [s5; [* Skylark03/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <a href`=[* `$Page2()]>Link to page2</a><br>&]
@@ -283,6 +288,7 @@ passed as argument of the function:&]
 [/@5 id] and [@5 #][/@5 id] insertion and combined from several files 
 using [@5 #include]:&]
 [s5; [* Skylark04/base.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <title>#TITLE</title>&]
 [s7; <body>&]
@@ -344,6 +350,7 @@ accessible using [* operator`[`]].&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark05/index.witz]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <form action`=[* `$Submit] method`=`"[* get]`" accept`-charset`=`"utf`-8`" 
@@ -358,6 +365,7 @@ enctype`=`"multipart/form`-data`">&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark05/submit.witz]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; Result: [* `$RESULT]<br>&]
@@ -415,6 +423,7 @@ default if not specified).&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark06/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <form action`=`$Submit method`=`"[* post]`" accept`-charset`=`"utf`-8`" 
@@ -430,6 +439,7 @@ enctype`=`"multipart/form`-data`">&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark06/submit.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; Result: `$RESULT<br>&]
@@ -495,6 +505,7 @@ with `'.`' as the first character.&]
 [s7; &]
 [s5; [* Skylark07/index.witz:]&]
 [s7; &]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <form action`=`$Submit method`=`"post`" accept`-charset`=`"utf`-8`" 
@@ -557,6 +568,7 @@ library `"skylark.js`".&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark08/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <script type`=`"text/javascript`" src`=`"[* `$static/Skylark/skylark.js]`"></scrip
 t>&]
@@ -705,6 +717,7 @@ create a new DB&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark09/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <table border`=`"1`">&]
@@ -892,6 +905,7 @@ NAME))]&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark10/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <table border`=`"1`">&]
@@ -915,6 +929,7 @@ NAME))]&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark10/dialog.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; <FORM action`=`$ACTION method`=`"post`" accept`-charset`=`"utf`-8`" 
@@ -1003,6 +1018,7 @@ that way U`+`+ i18n system can be used in Skylark handlers.&]
 [s7; &]
 [s7; &]
 [s5; [* Skylark11/index.witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; #include lang&]
@@ -1013,6 +1029,7 @@ that way U`+`+ i18n system can be used in Skylark handlers.&]
 [s7; &]
 [s7; &]
 [s5;%- [* Skylark11/index.][*_ cs`-cz][* .witz:]&]
+[s7; <!DOCTYPE html>&]
 [s7; <html>&]
 [s7; <body>&]
 [s7; #include lang&]
