diff --git a/CMakeLists.txt b/CMakeLists.txt
index 939e12c7..0ea8a746 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ if (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64")
     set(X86_64 1)
 endif ()
 
-# ⚠️ SET these configurations via CLion Preferences… Build->CMake->Profiles
+# ⚠️ SET these configurations VIA TOOLCHAIN: via CLion Preferences… Build->CMake->Profiles
 #  MANUALLY force set these only for urgent debugging
 #set(RELEASE 1) # no tests todo VS:
 #set(NO_TESTS 1) # no tests
@@ -18,8 +18,9 @@ endif ()
 #set(VERBOSE 1)
 #set(DEBUG 1)
 #set(TRACE 1)
+set(STRICT 1)
 #set(SDL 1) # Graphics
-#set(WASM 1) # no WebView, duh SET VIA TOOLCHAIN!
+#set(WASM 1) # SET VIA TOOLCHAIN!
 #set(INCLUDE_MERGER 0) # include wasm_linker.cpp
 #set(WABT_MERGE 1) # not the whole WABT though, heavy
 #ADD_DEFINITIONS(-DMULTI_VALUE) # change ABI to always return (value, type) tuple
@@ -193,7 +194,10 @@ endif ()
 ADD_COMPILE_FLAG("-fno-inline") # why not? debug?
 
 # ENABLE:
-#ADD_COMPILE_FLAG("-Werror") # WARNINGS AS ERRORS!  use -Wno-error=… for exceptions
+if (STRICT)
+    ADD_COMPILE_FLAG("-Wall")
+    ADD_COMPILE_FLAG("-Werror") # WARNINGS AS ERRORS!  use -Wno-error=… for exceptions
+endif ()
 ADD_COMPILE_FLAG("-Wformat") # essential !! print("%s",string) => memory corruption!
 ADD_COMPILE_FLAG("-Wreturn-type") # VERY USEFUL : non-void function does not return a value
 ADD_COMPILE_FLAG("-Wunused-result") # VERY USEFUL : check for nodiscard, e.g. in non-self-modifying replace()
diff --git a/index.html b/index.html
index dbc19245..10a938c1 100644
--- a/index.html
+++ b/index.html
@@ -43,6 +43,9 @@ <h2>A new programming language for wasm</h2>
 <script type="text/javascript">
     const canvas = document.getElementById('canvas');
     const ctx = canvas.getContext('2d');
+    // draw a red rectangle
+    ctx.fillStyle = 'red';
+    ctx.fillRect(10, 10, 150, 100);
 </script>
 
 </body>
diff --git a/source/tests.cpp b/source/tests.cpp
index e191ee42..c117fcbe 100644
--- a/source/tests.cpp
+++ b/source/tests.cpp
@@ -21,12 +21,21 @@
 
 #define assert_parses(marka) result=assert_parsesx(marka);if(result==ERROR){printf("NOT PARSING %s\n",marka);backtrace_line();}
 
-void testDom() {
+
+void testCanvas() {
 	result = analyze(parse("$canvas"));
 	assert_equals(result.kind, (int64) externref);
-	auto nod = eval("$canvas;123");
+	auto nod = eval("    ctx = $canvas.getContext('2d');\n"
+	                "    ctx.fillStyle = 'red';\n"
+	                "    ctx.fillRect(10, 10, 150, 100);");
 	print(nod);
+}
+
+void testDom() {
+	result = analyze(parse("$canvas"));
+	assert_equals(result.kind, (int64) externref);
 //	embedder.trace('canvas = document.getElementById("canvas");')
+//	print(nod);
 }
 
 void testTypes() {
@@ -668,7 +677,7 @@ void testHyphenUnits() {
 }
 
 void testHypenVersusMinus() {
-	const char *code = "a=1 b=2 b-a";
+	const char *code = "a=-1 b=2 b-a";
 	assert_emit(code, 3);
 	// kebab case
 	const char *data = "a-b:2 c-d:4 a-b";
@@ -3273,15 +3282,11 @@ void testCurrent() {
 
 
 //	exit(1);
-	assert_emit("(2 4 3)[1]", 4);
-	assert_eval("if (0) {3}", false);
 
 	testSubGroupingFlatten();
 	testTypedFunctions();
 	testTypes();
 	testPolymorphism();
-//	assert_emit("√3^2", 3)
-//	testSinus();
 	testDom();
 //    testKebabCase();
 	skip(
diff --git a/source/wasm_emitter.cpp b/source/wasm_emitter.cpp
index bd04b012..860f9825 100644
--- a/source/wasm_emitter.cpp
+++ b/source/wasm_emitter.cpp
@@ -1668,7 +1668,7 @@ Code emitOperator(Node &node, Function &context) {
 			code.add(0x01); // todo: memory index argument!?
 		if (last_type == none or last_type == voids)
 			last_type = i32t;
-		if (opcode >= 0x45 and opcode <= 0x78 or opcode == string_eq)
+		if ((opcode >= 0x45 and opcode <= 0x78) or opcode == string_eq)
 			last_type = i32;// int ops (also f64.eqz …)
 	} else if (name == "²") {
 //		error("this should be handled universally in analyse: x² => x*x no matter what!");