diff --git a/src/main/gen/dev/blachut/svelte/lang/parsing/html/_SvelteHtmlLexer.java b/src/main/gen/dev/blachut/svelte/lang/parsing/html/_SvelteHtmlLexer.java
index 1d696290..06e2a2c9 100644
--- a/src/main/gen/dev/blachut/svelte/lang/parsing/html/_SvelteHtmlLexer.java
+++ b/src/main/gen/dev/blachut/svelte/lang/parsing/html/_SvelteHtmlLexer.java
@@ -4,6 +4,7 @@
 package dev.blachut.svelte.lang.parsing.html;
 
 import com.intellij.lexer.FlexLexer;
+import com.intellij.psi.TokenType;
 import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.xml.XmlTokenType;
 import dev.blachut.svelte.lang.psi.SvelteTokenTypes;
@@ -303,73 +304,74 @@ private static int zzUnpackRowMap(String packed, int offset, int [] result) {
     "\1\126\5\124\30\125\2\124\1\127\3\124\1\131\3\124"+
     "\5\125\2\124\4\125\3\132\2\133\5\132\1\134\3\132"+
     "\1\133\35\132\1\135\1\132\1\136\3\132\1\137\1\140"+
-    "\41\132\1\141\1\132\1\142\4\132\1\143\13\132\1\144"+
-    "\2\132\1\135\11\132\1\145\10\132\10\25\1\27\4\25"+
-    "\2\0\1\25\1\0\33\25\1\0\4\25\2\0\17\25"+
-    "\1\26\4\25\1\27\4\25\1\0\1\31\1\25\1\0"+
-    "\33\25\1\0\4\25\2\0\24\25\1\27\4\25\2\0"+
-    "\1\25\1\0\33\25\1\0\22\25\102\0\1\31\12\0"+
-    "\1\31\61\0\1\146\7\0\2\146\6\0\1\147\30\146"+
-    "\3\0\1\150\1\151\5\0\5\146\2\0\4\146\1\0"+
-    "\1\152\7\0\2\152\7\0\21\152\1\153\6\152\10\0"+
-    "\1\154\1\0\2\152\1\155\1\152\1\156\2\0\1\153"+
-    "\1\157\2\152\3\0\1\36\12\0\1\36\60\0\5\160"+
-    "\1\110\71\160\6\161\1\110\70\161\44\0\2\162\60\0"+
-    "\2\163\62\0\1\164\103\0\1\165\56\0\2\54\6\0"+
-    "\4\54\5\0\30\54\12\0\5\54\2\0\4\54\56\0"+
-    "\1\166\23\0\1\60\12\0\1\60\132\0\1\167\24\0"+
-    "\5\63\2\0\7\63\3\0\31\63\1\0\3\63\1\0"+
-    "\23\63\1\64\1\63\2\0\7\63\1\36\2\0\31\63"+
-    "\1\0\3\63\1\0\20\63\5\0\3\67\67\0\15\77"+
-    "\1\170\1\0\33\77\1\0\3\77\1\171\23\77\1\100"+
-    "\11\77\1\170\1\36\33\77\1\0\3\77\1\171\35\77"+
-    "\1\170\1\0\33\77\1\167\3\77\1\171\20\77\5\105"+
-    "\2\0\6\105\1\170\1\0\33\105\1\0\3\105\1\172"+
-    "\23\105\1\106\1\105\2\0\6\105\1\170\1\60\33\105"+
-    "\1\0\3\105\1\172\72\105\1\167\3\105\1\172\20\105"+
-    "\61\0\1\110\15\0\52\116\1\0\2\116\1\173\73\116"+
-    "\1\117\24\116\1\0\3\125\7\0\1\125\2\0\1\125"+
-    "\2\0\31\125\1\0\2\125\7\0\5\125\2\0\4\125"+
-    "\14\0\1\174\134\0\1\175\27\0\2\133\11\0\1\133"+
-    "\146\0\1\176\47\0\1\177\102\0\1\200\22\0\1\201"+
-    "\74\0\1\202\101\0\1\203\10\0\2\146\6\0\4\146"+
-    "\5\0\30\146\12\0\5\146\2\0\4\146\14\0\1\204"+
-    "\5\0\1\205\55\0\1\206\7\0\2\206\7\0\30\206"+
-    "\12\0\5\206\2\0\4\206\1\0\2\152\6\0\4\152"+
-    "\5\0\30\152\12\0\5\152\1\0\1\207\4\152\1\0"+
-    "\2\152\6\0\4\152\5\0\6\152\1\210\21\152\12\0"+
-    "\5\152\1\0\1\207\4\152\2\0\1\211\72\0\1\212"+
-    "\2\0\2\152\6\0\4\152\5\0\11\152\1\213\5\152"+
-    "\1\214\10\152\12\0\5\152\1\0\1\207\4\152\1\0"+
-    "\2\152\6\0\4\152\5\0\25\152\1\215\2\152\12\0"+
-    "\5\152\1\0\1\207\4\152\1\0\2\152\6\0\4\152"+
-    "\5\0\23\152\1\216\4\152\12\0\5\152\1\0\1\207"+
-    "\4\152\46\0\2\217\67\0\2\220\56\0\1\221\30\0"+
-    "\1\222\40\0\1\223\42\0\1\224\17\0\52\77\1\0"+
-    "\3\77\1\171\20\77\52\105\1\0\3\105\1\172\20\105"+
-    "\52\116\1\0\24\116\52\0\1\222\54\0\1\225\103\0"+
-    "\1\226\126\0\1\227\37\0\1\230\136\0\1\231\24\0"+
-    "\1\232\105\0\2\233\53\0\2\206\6\0\4\206\5\0"+
-    "\30\206\12\0\5\206\2\0\4\206\1\0\2\152\6\0"+
-    "\4\152\5\0\30\152\12\0\5\152\1\0\1\234\4\152"+
-    "\2\0\1\211\67\0\1\234\6\0\1\235\17\0\1\235"+
-    "\2\0\2\235\5\0\2\235\10\0\2\235\14\0\1\235"+
-    "\1\0\1\235\7\0\1\235\1\0\2\152\6\0\4\152"+
-    "\5\0\2\152\1\236\25\152\12\0\5\152\1\0\1\207"+
-    "\4\152\1\0\2\152\6\0\4\152\5\0\11\152\1\210"+
-    "\16\152\12\0\5\152\1\0\1\207\4\152\1\0\2\152"+
-    "\6\0\4\152\5\0\30\152\12\0\1\152\1\214\3\152"+
+    "\16\132\2\133\11\132\1\133\7\132\1\141\1\132\1\142"+
+    "\4\132\1\143\13\132\1\144\2\132\1\135\11\132\1\145"+
+    "\10\132\10\25\1\27\4\25\2\0\1\25\1\0\33\25"+
+    "\1\0\4\25\2\0\17\25\1\26\4\25\1\27\4\25"+
+    "\1\0\1\31\1\25\1\0\33\25\1\0\4\25\2\0"+
+    "\24\25\1\27\4\25\2\0\1\25\1\0\33\25\1\0"+
+    "\22\25\102\0\1\31\12\0\1\31\61\0\1\146\7\0"+
+    "\2\146\6\0\1\147\30\146\3\0\1\150\1\151\5\0"+
+    "\5\146\2\0\4\146\1\0\1\152\7\0\2\152\7\0"+
+    "\21\152\1\153\6\152\10\0\1\154\1\0\2\152\1\155"+
+    "\1\152\1\156\2\0\1\153\1\157\2\152\3\0\1\36"+
+    "\12\0\1\36\60\0\5\160\1\110\71\160\6\161\1\110"+
+    "\70\161\44\0\2\162\60\0\2\163\62\0\1\164\103\0"+
+    "\1\165\56\0\2\54\6\0\4\54\5\0\30\54\12\0"+
+    "\5\54\2\0\4\54\56\0\1\166\23\0\1\60\12\0"+
+    "\1\60\132\0\1\167\24\0\5\63\2\0\7\63\3\0"+
+    "\31\63\1\0\3\63\1\0\23\63\1\64\1\63\2\0"+
+    "\7\63\1\36\2\0\31\63\1\0\3\63\1\0\20\63"+
+    "\5\0\3\67\67\0\15\77\1\170\1\0\33\77\1\0"+
+    "\3\77\1\171\23\77\1\100\11\77\1\170\1\36\33\77"+
+    "\1\0\3\77\1\171\35\77\1\170\1\0\33\77\1\167"+
+    "\3\77\1\171\20\77\5\105\2\0\6\105\1\170\1\0"+
+    "\33\105\1\0\3\105\1\172\23\105\1\106\1\105\2\0"+
+    "\6\105\1\170\1\60\33\105\1\0\3\105\1\172\72\105"+
+    "\1\167\3\105\1\172\20\105\61\0\1\110\15\0\52\116"+
+    "\1\0\2\116\1\173\73\116\1\117\24\116\1\0\3\125"+
+    "\7\0\1\125\2\0\1\125\2\0\31\125\1\0\2\125"+
+    "\7\0\5\125\2\0\4\125\14\0\1\174\134\0\1\175"+
+    "\27\0\2\133\11\0\1\133\146\0\1\176\47\0\1\177"+
+    "\102\0\1\200\22\0\1\201\74\0\1\202\101\0\1\203"+
+    "\10\0\2\146\6\0\4\146\5\0\30\146\12\0\5\146"+
+    "\2\0\4\146\14\0\1\204\5\0\1\205\55\0\1\206"+
+    "\7\0\2\206\7\0\30\206\12\0\5\206\2\0\4\206"+
+    "\1\0\2\152\6\0\4\152\5\0\30\152\12\0\5\152"+
     "\1\0\1\207\4\152\1\0\2\152\6\0\4\152\5\0"+
-    "\2\152\1\153\25\152\12\0\5\152\1\0\1\207\4\152"+
-    "\42\0\2\237\75\0\2\240\105\0\1\241\40\0\1\242"+
-    "\110\0\1\243\140\0\1\244\43\0\1\245\100\0\1\246"+
-    "\110\0\1\247\52\0\2\250\52\0\1\235\17\0\1\235"+
-    "\2\0\2\235\5\0\2\235\10\0\2\235\14\0\1\235"+
-    "\1\0\1\235\3\0\1\234\3\0\1\235\1\0\2\152"+
-    "\6\0\4\152\5\0\30\152\12\0\1\152\1\210\3\152"+
-    "\1\0\1\207\4\152\50\0\2\251\41\0\1\221\35\0"+
-    "\1\222\63\0\1\252\67\0\1\253\75\0\2\254\73\0"+
-    "\2\255\101\0\1\256\77\0\2\257\77\0\2\260\41\0";
+    "\6\152\1\210\21\152\12\0\5\152\1\0\1\207\4\152"+
+    "\2\0\1\211\72\0\1\212\2\0\2\152\6\0\4\152"+
+    "\5\0\11\152\1\213\5\152\1\214\10\152\12\0\5\152"+
+    "\1\0\1\207\4\152\1\0\2\152\6\0\4\152\5\0"+
+    "\25\152\1\215\2\152\12\0\5\152\1\0\1\207\4\152"+
+    "\1\0\2\152\6\0\4\152\5\0\23\152\1\216\4\152"+
+    "\12\0\5\152\1\0\1\207\4\152\46\0\2\217\67\0"+
+    "\2\220\56\0\1\221\30\0\1\222\40\0\1\223\42\0"+
+    "\1\224\17\0\52\77\1\0\3\77\1\171\20\77\52\105"+
+    "\1\0\3\105\1\172\20\105\52\116\1\0\24\116\52\0"+
+    "\1\222\54\0\1\225\103\0\1\226\126\0\1\227\37\0"+
+    "\1\230\136\0\1\231\24\0\1\232\105\0\2\233\53\0"+
+    "\2\206\6\0\4\206\5\0\30\206\12\0\5\206\2\0"+
+    "\4\206\1\0\2\152\6\0\4\152\5\0\30\152\12\0"+
+    "\5\152\1\0\1\234\4\152\2\0\1\211\67\0\1\234"+
+    "\6\0\1\235\17\0\1\235\2\0\2\235\5\0\2\235"+
+    "\10\0\2\235\14\0\1\235\1\0\1\235\7\0\1\235"+
+    "\1\0\2\152\6\0\4\152\5\0\2\152\1\236\25\152"+
+    "\12\0\5\152\1\0\1\207\4\152\1\0\2\152\6\0"+
+    "\4\152\5\0\11\152\1\210\16\152\12\0\5\152\1\0"+
+    "\1\207\4\152\1\0\2\152\6\0\4\152\5\0\30\152"+
+    "\12\0\1\152\1\214\3\152\1\0\1\207\4\152\1\0"+
+    "\2\152\6\0\4\152\5\0\2\152\1\153\25\152\12\0"+
+    "\5\152\1\0\1\207\4\152\42\0\2\237\75\0\2\240"+
+    "\105\0\1\241\40\0\1\242\110\0\1\243\140\0\1\244"+
+    "\43\0\1\245\100\0\1\246\110\0\1\247\52\0\2\250"+
+    "\52\0\1\235\17\0\1\235\2\0\2\235\5\0\2\235"+
+    "\10\0\2\235\14\0\1\235\1\0\1\235\3\0\1\234"+
+    "\3\0\1\235\1\0\2\152\6\0\4\152\5\0\30\152"+
+    "\12\0\1\152\1\210\3\152\1\0\1\207\4\152\50\0"+
+    "\2\251\41\0\1\221\35\0\1\222\63\0\1\252\67\0"+
+    "\1\253\75\0\2\254\73\0\2\255\101\0\1\256\77\0"+
+    "\2\257\77\0\2\260\41\0";
 
   private static int [] zzUnpackTrans() {
     int [] result = new int[7056];
@@ -967,7 +969,7 @@ else if (zzAtEOF) {
             // fall through
           case 100: break;
           case 38:
-            { return SvelteTokenTypes.TEMP_PREFIX;
+            { return TokenType.WHITE_SPACE;
             }
             // fall through
           case 101: break;
diff --git a/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteHtmlLexer.flex b/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteHtmlLexer.flex
index fe05e8cb..b2f90e22 100644
--- a/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteHtmlLexer.flex
+++ b/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteHtmlLexer.flex
@@ -4,6 +4,7 @@ package dev.blachut.svelte.lang.parsing.html;
 import com.intellij.lexer.FlexLexer;
 import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.xml.*;
+import com.intellij.psi.TokenType;
 import dev.blachut.svelte.lang.psi.SvelteTokenTypes;
 
 %%
@@ -147,7 +148,7 @@ CONDITIONAL_COMMENT_CONDITION=({ALPHA})({ALPHA}|{WHITE_SPACE_CHARS}|{DIGIT}|"."|
 <YYINITIAL> "{" { yybeginNestable(SVELTE_INTERPOLATION_START); return SvelteTokenTypes.START_MUSTACHE_TEMP; }
 
 <SVELTE_INTERPOLATION_START> {
-  {WHITE_SPACE}      { return SvelteTokenTypes.TEMP_PREFIX; }
+  {WHITE_SPACE}      { return TokenType.WHITE_SPACE; }
   "#"                { yybegin(SVELTE_INTERPOLATION_KEYWORD); return SvelteTokenTypes.HASH; }
   ":"                { yybegin(SVELTE_INTERPOLATION_KEYWORD); return SvelteTokenTypes.COLON; }
   "/"                { yybegin(SVELTE_INTERPOLATION_KEYWORD); return SvelteTokenTypes.SLASH; }
@@ -156,8 +157,7 @@ CONDITIONAL_COMMENT_CONDITION=({ALPHA})({ALPHA}|{WHITE_SPACE_CHARS}|{DIGIT}|"."|
 }
 
 <SVELTE_INTERPOLATION_KEYWORD> {
-  // TODO Disallow whitespace
-  // {WHITE_SPACE}      { return BAD_CHARACTER; }
+  {WHITE_SPACE}      { return TokenType.WHITE_SPACE; }
   "if"               { yybegin(SVELTE_INTERPOLATION); return SvelteTokenTypes.LAZY_IF; }
   "else"             { yybegin(SVELTE_INTERPOLATION); return SvelteTokenTypes.LAZY_ELSE; }
   "each"             { yybegin(SVELTE_INTERPOLATION); return SvelteTokenTypes.LAZY_EACH; }
diff --git a/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteManualParsing.kt b/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteManualParsing.kt
index 4c79a6bb..ae0566c3 100644
--- a/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteManualParsing.kt
+++ b/src/main/java/dev/blachut/svelte/lang/parsing/html/SvelteManualParsing.kt
@@ -2,24 +2,25 @@ package dev.blachut.svelte.lang.parsing.html
 
 import com.intellij.lang.PsiBuilder
 import com.intellij.lang.javascript.JSTokenTypes
-import com.intellij.psi.TokenType
 import com.intellij.psi.tree.IElementType
 import com.intellij.psi.tree.ILazyParseableElementType
+import dev.blachut.svelte.lang.isTokenAfterWhiteSpace
 import dev.blachut.svelte.lang.psi.SvelteBlockLazyElementTypes
 import dev.blachut.svelte.lang.psi.SvelteJSLazyElementTypes
 import dev.blachut.svelte.lang.psi.SvelteTokenTypes
 
 object SvelteManualParsing {
+    fun parseNotAllowedWhitespace(builder: PsiBuilder, precedingSymbol: String) {
+        if (builder.isTokenAfterWhiteSpace()) {
+            builder.error("whitespace is not allowed after $precedingSymbol")
+        }
+    }
+
     fun parseLazyBlock(builder: PsiBuilder): Pair<IElementType, PsiBuilder.Marker> {
         val marker = builder.mark()
         builder.remapCurrentToken(JSTokenTypes.LBRACE)
         builder.advanceLexer()
 
-        if (builder.tokenType == SvelteTokenTypes.TEMP_PREFIX) {
-            builder.remapCurrentToken(TokenType.WHITE_SPACE)
-            builder.advanceLexer()
-        }
-
         if (builder.tokenType == SvelteTokenTypes.HASH) {
             builder.advanceLexer()
             val token = when (builder.tokenType) {
@@ -41,6 +42,8 @@ object SvelteManualParsing {
         } else if (builder.tokenType == SvelteTokenTypes.SLASH) {
             builder.remapCurrentToken(JSTokenTypes.DIV)
             builder.advanceLexer()
+            parseNotAllowedWhitespace(builder, "/")
+
             val token = when (builder.tokenType) {
                 SvelteTokenTypes.LAZY_IF -> {
                     builder.remapCurrentToken(JSTokenTypes.IF_KEYWORD)
diff --git a/src/main/java/dev/blachut/svelte/lang/psi/SvelteBlockLazyElementTypes.kt b/src/main/java/dev/blachut/svelte/lang/psi/SvelteBlockLazyElementTypes.kt
index 7d8cf3f6..484554ce 100644
--- a/src/main/java/dev/blachut/svelte/lang/psi/SvelteBlockLazyElementTypes.kt
+++ b/src/main/java/dev/blachut/svelte/lang/psi/SvelteBlockLazyElementTypes.kt
@@ -3,6 +3,7 @@ package dev.blachut.svelte.lang.psi
 import com.intellij.lang.PsiBuilder
 import com.intellij.lang.javascript.JSTokenTypes
 import com.intellij.lang.javascript.parsing.JavaScriptParser
+import dev.blachut.svelte.lang.parsing.html.SvelteManualParsing
 
 object SvelteBlockLazyElementTypes {
     val IF_START = object : SvelteBlockLazyElementType("IF_START") {
@@ -10,6 +11,7 @@ object SvelteBlockLazyElementTypes {
 
         override fun parseTokens(builder: PsiBuilder, parser: JavaScriptParser<*, *, *, *>) {
             builder.advanceLexer() // JSTokenTypes.SHARP
+            SvelteManualParsing.parseNotAllowedWhitespace(builder, "#")
             builder.advanceLexer() // JSTokenTypes.IF_KEYWORD
 
             parser.expressionParser.parseExpression()
@@ -21,6 +23,7 @@ object SvelteBlockLazyElementTypes {
 
         override fun parseTokens(builder: PsiBuilder, parser: JavaScriptParser<*, *, *, *>) {
             builder.advanceLexer() // JSTokenTypes.COLON
+            SvelteManualParsing.parseNotAllowedWhitespace(builder, ":")
             builder.advanceLexer() // JSTokenTypes.ELSE_KEYWORD
 
             if (builder.tokenType === JSTokenTypes.IF_KEYWORD) {
@@ -39,6 +42,7 @@ object SvelteBlockLazyElementTypes {
 
         override fun parseTokens(builder: PsiBuilder, parser: JavaScriptParser<*, *, *, *>) {
             builder.advanceLexer() // JSTokenTypes.SHARP
+            SvelteManualParsing.parseNotAllowedWhitespace(builder, "#")
             builder.advanceLexer() // JSTokenTypes.IDENTIFIER -- fake EACH
 
             parser.expressionParser.parseExpression()
@@ -76,6 +80,7 @@ object SvelteBlockLazyElementTypes {
 
         override fun parseTokens(builder: PsiBuilder, parser: JavaScriptParser<*, *, *, *>) {
             builder.advanceLexer() // JSTokenTypes.SHARP
+            SvelteManualParsing.parseNotAllowedWhitespace(builder, "#")
             builder.advanceLexer() // JSTokenTypes.AWAIT_KEYWORD
 
             parser.expressionParser.parseExpression()
@@ -93,6 +98,7 @@ object SvelteBlockLazyElementTypes {
 
         override fun parseTokens(builder: PsiBuilder, parser: JavaScriptParser<*, *, *, *>) {
             builder.advanceLexer() // JSTokenTypes.COLON
+            SvelteManualParsing.parseNotAllowedWhitespace(builder, ":")
             builder.advanceLexer() // JSTokenTypes.IDENTIFIER -- fake THEN
 
             // TODO Check weird RBRACE placement
@@ -105,6 +111,7 @@ object SvelteBlockLazyElementTypes {
 
         override fun parseTokens(builder: PsiBuilder, parser: JavaScriptParser<*, *, *, *>) {
             builder.advanceLexer() // JSTokenTypes.COLON
+            SvelteManualParsing.parseNotAllowedWhitespace(builder, ":")
             builder.advanceLexer() // JSTokenTypes.CATCH_KEYWORD
 
             parser.expressionParser.parseDestructuringElement(SvelteJSElementTypes.PARAMETER, false, false)
diff --git a/src/main/java/dev/blachut/svelte/lang/psi/SvelteTokenTypes.kt b/src/main/java/dev/blachut/svelte/lang/psi/SvelteTokenTypes.kt
index c99c9cfd..e0ebdc8b 100644
--- a/src/main/java/dev/blachut/svelte/lang/psi/SvelteTokenTypes.kt
+++ b/src/main/java/dev/blachut/svelte/lang/psi/SvelteTokenTypes.kt
@@ -13,8 +13,6 @@ object SvelteTokenTypes {
     @JvmField
     val END_MUSTACHE = SvelteElementType("END_MUSTACHE")
 
-    @JvmField
-    val TEMP_PREFIX = SvelteElementType("TEMP_PREFIX")
     @JvmField
     val LAZY_IF = SvelteElementType("LAZY_IF")
     @JvmField