diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/IntrinsicifyCallsLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/IntrinsicifyCallsLowering.kt
index 4c292ae63a9..fe4ef119667 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/IntrinsicifyCallsLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/IntrinsicifyCallsLowering.kt
@@ -260,7 +260,7 @@ class IntrinsicifyCallsLowering(private val context: JsIrBackendContext) : FileL
             put(Name.identifier("equals"), ::transformEqualsMethodCall)
         }
 
-        dynamicCallOriginToIrFunction.run {
+        dynamicCallOriginToIrFunction.apply {
             put(IrStatementOrigin.EXCL, context.intrinsics.jsNot)
 
             put(IrStatementOrigin.LT, context.intrinsics.jsLt)
@@ -296,6 +296,8 @@ class IntrinsicifyCallsLowering(private val context: JsIrBackendContext) : FileL
             put(IrStatementOrigin.POSTFIX_INCR, context.intrinsics.jsPostfixInc)
             put(IrStatementOrigin.POSTFIX_DECR, context.intrinsics.jsPostfixDec)
             put(IrStatementOrigin.GET_ARRAY_ELEMENT, context.intrinsics.jsArrayGet)
+            // TODO add a special statement origin, e.g. SET_ARRAY_ELEMENT
+            put(IrStatementOrigin.EQ, context.intrinsics.jsArraySet)
         }
     }
 
diff --git a/compiler/testData/codegen/box/arrays/hashMap.kt b/compiler/testData/codegen/box/arrays/hashMap.kt
index f5aff0d311e..9c04d4911d6 100644
--- a/compiler/testData/codegen/box/arrays/hashMap.kt
+++ b/compiler/testData/codegen/box/arrays/hashMap.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 operator fun HashMap<String, Int?>.set(index: String, elem: Int?) {
     this.put(index, elem)
 }
diff --git a/compiler/testData/codegen/box/arrays/kt950.kt b/compiler/testData/codegen/box/arrays/kt950.kt
index 2b88d0df9b9..f9d26d44d43 100644
--- a/compiler/testData/codegen/box/arrays/kt950.kt
+++ b/compiler/testData/codegen/box/arrays/kt950.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 operator fun <K, V> MutableMap<K, V>.set(k : K, v : V) = put(k, v)
 
 fun box() : String {
diff --git a/compiler/testData/codegen/box/casts/mutableCollections/asWithMutable.kt b/compiler/testData/codegen/box/casts/mutableCollections/asWithMutable.kt
index 384052fc561..fc38540ef01 100644
--- a/compiler/testData/codegen/box/casts/mutableCollections/asWithMutable.kt
+++ b/compiler/testData/codegen/box/casts/mutableCollections/asWithMutable.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND: JS_IR, JVM_IR
+// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
diff --git a/compiler/testData/codegen/box/casts/mutableCollections/isWithMutable.kt b/compiler/testData/codegen/box/casts/mutableCollections/isWithMutable.kt
index b6a1c326c1d..91c880e800d 100644
--- a/compiler/testData/codegen/box/casts/mutableCollections/isWithMutable.kt
+++ b/compiler/testData/codegen/box/casts/mutableCollections/isWithMutable.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND: JS_IR, JVM_IR
+// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
diff --git a/compiler/testData/codegen/box/casts/mutableCollections/reifiedAsWithMutable.kt b/compiler/testData/codegen/box/casts/mutableCollections/reifiedAsWithMutable.kt
index 6da66b448dc..34f8987b825 100644
--- a/compiler/testData/codegen/box/casts/mutableCollections/reifiedAsWithMutable.kt
+++ b/compiler/testData/codegen/box/casts/mutableCollections/reifiedAsWithMutable.kt
@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
diff --git a/compiler/testData/codegen/box/casts/mutableCollections/reifiedIsWithMutable.kt b/compiler/testData/codegen/box/casts/mutableCollections/reifiedIsWithMutable.kt
index 33d91570a9e..a552f1cc54f 100644
--- a/compiler/testData/codegen/box/casts/mutableCollections/reifiedIsWithMutable.kt
+++ b/compiler/testData/codegen/box/casts/mutableCollections/reifiedIsWithMutable.kt
@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
diff --git a/compiler/testData/codegen/box/casts/mutableCollections/reifiedSafeAsWithMutable.kt b/compiler/testData/codegen/box/casts/mutableCollections/reifiedSafeAsWithMutable.kt
index e6ab717d1d5..0551e381556 100644
--- a/compiler/testData/codegen/box/casts/mutableCollections/reifiedSafeAsWithMutable.kt
+++ b/compiler/testData/codegen/box/casts/mutableCollections/reifiedSafeAsWithMutable.kt
@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
diff --git a/compiler/testData/codegen/box/casts/mutableCollections/safeAsWithMutable.kt b/compiler/testData/codegen/box/casts/mutableCollections/safeAsWithMutable.kt
index c17b5dd5211..cf73d582aed 100644
--- a/compiler/testData/codegen/box/casts/mutableCollections/safeAsWithMutable.kt
+++ b/compiler/testData/codegen/box/casts/mutableCollections/safeAsWithMutable.kt
@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
diff --git a/compiler/testData/codegen/box/classes/inheritSetAndHashSet.kt b/compiler/testData/codegen/box/classes/inheritSetAndHashSet.kt
index 81808bd7937..b5799632fdf 100644
--- a/compiler/testData/codegen/box/classes/inheritSetAndHashSet.kt
+++ b/compiler/testData/codegen/box/classes/inheritSetAndHashSet.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // IGNORE_BACKEND: NATIVE
 
 interface A : Set<String>
diff --git a/compiler/testData/codegen/box/classes/kt2417.kt b/compiler/testData/codegen/box/classes/kt2417.kt
index 042ec97648c..fe584cce56a 100644
--- a/compiler/testData/codegen/box/classes/kt2417.kt
+++ b/compiler/testData/codegen/box/classes/kt2417.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun box() : String{
     val set = HashSet<String>()
     set.add("foo")
diff --git a/compiler/testData/codegen/box/collections/inSetWithSmartCast.kt b/compiler/testData/codegen/box/collections/inSetWithSmartCast.kt
index 7bac2cd54f1..ee4987608d6 100644
--- a/compiler/testData/codegen/box/collections/inSetWithSmartCast.kt
+++ b/compiler/testData/codegen/box/collections/inSetWithSmartCast.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 fun contains(set: Set<Any>, x: Int): Boolean = when {
diff --git a/compiler/testData/codegen/box/controlStructures/kt910.kt b/compiler/testData/codegen/box/controlStructures/kt910.kt
index bf069790804..a9226bbdba2 100644
--- a/compiler/testData/codegen/box/controlStructures/kt910.kt
+++ b/compiler/testData/codegen/box/controlStructures/kt910.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun foo() : Int =
     try {
         2
diff --git a/compiler/testData/codegen/box/delegatedProperty/provideDelegate/evaluationOrderVar.kt b/compiler/testData/codegen/box/delegatedProperty/provideDelegate/evaluationOrderVar.kt
index db67127bfef..872234beafb 100644
--- a/compiler/testData/codegen/box/delegatedProperty/provideDelegate/evaluationOrderVar.kt
+++ b/compiler/testData/codegen/box/delegatedProperty/provideDelegate/evaluationOrderVar.kt
@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 import kotlin.test.*
diff --git a/compiler/testData/codegen/box/javaInterop/notNullAssertions/mapPut.kt b/compiler/testData/codegen/box/javaInterop/notNullAssertions/mapPut.kt
index 5ace5c4a6d8..c39287e7d2b 100644
--- a/compiler/testData/codegen/box/javaInterop/notNullAssertions/mapPut.kt
+++ b/compiler/testData/codegen/box/javaInterop/notNullAssertions/mapPut.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 
 fun <K: Any, V: Any> foo(k: K, v: V) {
     val map = HashMap<K, V>()
diff --git a/compiler/testData/codegen/box/jdk/hashMap.kt b/compiler/testData/codegen/box/jdk/hashMap.kt
index 9f1ce1d4ff5..3574e445e4c 100644
--- a/compiler/testData/codegen/box/jdk/hashMap.kt
+++ b/compiler/testData/codegen/box/jdk/hashMap.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 
 fun box(): String {
     val map: MutableMap<String, Int> = HashMap<String, Int>()
diff --git a/compiler/testData/codegen/box/jdk/iteratingOverHashMap.kt b/compiler/testData/codegen/box/jdk/iteratingOverHashMap.kt
index b943b3b4707..c7d4b0752f7 100644
--- a/compiler/testData/codegen/box/jdk/iteratingOverHashMap.kt
+++ b/compiler/testData/codegen/box/jdk/iteratingOverHashMap.kt
@@ -1,4 +1,4 @@
-// IGNORE_BACKEND: JS_IR, JVM_IR
+// IGNORE_BACKEND: JVM_IR
 
 fun box() : String {
     if (!testIteratingOverMap1()) return "fail 1"
diff --git a/compiler/testData/codegen/box/multiDecl/kt9828_hashMap.kt b/compiler/testData/codegen/box/multiDecl/kt9828_hashMap.kt
index dceded9ff45..8793aef1b14 100644
--- a/compiler/testData/codegen/box/multiDecl/kt9828_hashMap.kt
+++ b/compiler/testData/codegen/box/multiDecl/kt9828_hashMap.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/objects/localFunctionInObjectInitializer_kt4516.kt b/compiler/testData/codegen/box/objects/localFunctionInObjectInitializer_kt4516.kt
index 4072aac689d..be7d8cdcd90 100644
--- a/compiler/testData/codegen/box/objects/localFunctionInObjectInitializer_kt4516.kt
+++ b/compiler/testData/codegen/box/objects/localFunctionInObjectInitializer_kt4516.kt
@@ -1,5 +1,4 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
 
 object O {
     val mmmap = HashMap<String, Int>();
diff --git a/compiler/testData/codegen/box/ranges/contains/kt20106.kt b/compiler/testData/codegen/box/ranges/contains/kt20106.kt
index 079eacd7dcc..2b2097f1e04 100644
--- a/compiler/testData/codegen/box/ranges/contains/kt20106.kt
+++ b/compiler/testData/codegen/box/ranges/contains/kt20106.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/regressions/kt3442.kt b/compiler/testData/codegen/box/regressions/kt3442.kt
index 7a273446da8..0a28219ff5f 100644
--- a/compiler/testData/codegen/box/regressions/kt3442.kt
+++ b/compiler/testData/codegen/box/regressions/kt3442.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 fun box(): String {
diff --git a/compiler/testData/codegen/box/regressions/resolvedCallForGetOperator.kt b/compiler/testData/codegen/box/regressions/resolvedCallForGetOperator.kt
index d4e655c51a4..8b0e9bd07b0 100644
--- a/compiler/testData/codegen/box/regressions/resolvedCallForGetOperator.kt
+++ b/compiler/testData/codegen/box/regressions/resolvedCallForGetOperator.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // WITH_RUNTIME
 
 val targetNameLists: Map<String, String> = mapOf("1"         to "OK")
diff --git a/compiler/testData/codegen/box/vararg/kt581.kt b/compiler/testData/codegen/box/vararg/kt581.kt
index 142845485c8..829dc640f1d 100644
--- a/compiler/testData/codegen/box/vararg/kt581.kt
+++ b/compiler/testData/codegen/box/vararg/kt581.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 package whats.the.difference
 
 fun iarray(vararg a : Int) = a // BUG
diff --git a/js/js.translator/testData/box/char/charConstantByUnicodeId.kt b/js/js.translator/testData/box/char/charConstantByUnicodeId.kt
index 61566cb9c05..c759a022931 100644
--- a/js/js.translator/testData/box/char/charConstantByUnicodeId.kt
+++ b/js/js.translator/testData/box/char/charConstantByUnicodeId.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1282
 package foo
 
diff --git a/js/js.translator/testData/box/dataClass/keyrole.kt b/js/js.translator/testData/box/dataClass/keyrole.kt
index 7fc66a1d4a4..33d0bc6f6c5 100644
--- a/js/js.translator/testData/box/dataClass/keyrole.kt
+++ b/js/js.translator/testData/box/dataClass/keyrole.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1317
 package foo
 
diff --git a/js/js.translator/testData/box/dataClass/privateFields.kt b/js/js.translator/testData/box/dataClass/privateFields.kt
index d73980f37f2..24d28bd4614 100644
--- a/js/js.translator/testData/box/dataClass/privateFields.kt
+++ b/js/js.translator/testData/box/dataClass/privateFields.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1292
 package foo
 
diff --git a/js/js.translator/testData/box/delegateProperty/metadataReferentialEquality.kt b/js/js.translator/testData/box/delegateProperty/metadataReferentialEquality.kt
index d6bcf52fc4b..c638958c99e 100644
--- a/js/js.translator/testData/box/delegateProperty/metadataReferentialEquality.kt
+++ b/js/js.translator/testData/box/delegateProperty/metadataReferentialEquality.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1302
 import kotlin.reflect.KProperty
 
diff --git a/js/js.translator/testData/box/dynamic/operationsWithAssignment.kt b/js/js.translator/testData/box/dynamic/operationsWithAssignment.kt
index a5b99cc2791..2ad9fbd1d50 100644
--- a/js/js.translator/testData/box/dynamic/operationsWithAssignment.kt
+++ b/js/js.translator/testData/box/dynamic/operationsWithAssignment.kt
@@ -21,6 +21,8 @@ fun box(): String {
     assertEquals(9.79999999999999, b)
     c += a * 3 + b / n
     assertEquals("text1318.233333333333334", c)
+    a = 14
+    assertEquals(14, a)
 
     return "OK"
 }
diff --git a/js/js.translator/testData/box/dynamic/setByBrackets.kt b/js/js.translator/testData/box/dynamic/setByBrackets.kt
index f7ec878895f..ca31b3283d2 100644
--- a/js/js.translator/testData/box/dynamic/setByBrackets.kt
+++ b/js/js.translator/testData/box/dynamic/setByBrackets.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1231
 package foo
 
diff --git a/js/js.translator/testData/box/expression/for/overCollectionWithIndex.kt b/js/js.translator/testData/box/expression/for/overCollectionWithIndex.kt
index c9e388d8cc0..32b17eca350 100644
--- a/js/js.translator/testData/box/expression/for/overCollectionWithIndex.kt
+++ b/js/js.translator/testData/box/expression/for/overCollectionWithIndex.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1652
 // CHECK_NOT_CALLED_IN_SCOPE: function=component1 scope=test1
 // CHECK_NOT_CALLED_IN_SCOPE: function=component1 scope=test2
diff --git a/js/js.translator/testData/box/expression/when/whenWithMapRangeClause.kt b/js/js.translator/testData/box/expression/when/whenWithMapRangeClause.kt
index 4585adee2cf..7340a6e42b0 100644
--- a/js/js.translator/testData/box/expression/when/whenWithMapRangeClause.kt
+++ b/js/js.translator/testData/box/expression/when/whenWithMapRangeClause.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1211
 
 package foo
diff --git a/js/js.translator/testData/box/inlineEvaluationOrder/methodDecomposedWithBind.kt b/js/js.translator/testData/box/inlineEvaluationOrder/methodDecomposedWithBind.kt
index 38624267865..bc999cd7a04 100644
--- a/js/js.translator/testData/box/inlineEvaluationOrder/methodDecomposedWithBind.kt
+++ b/js/js.translator/testData/box/inlineEvaluationOrder/methodDecomposedWithBind.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1525
 package foo
 
diff --git a/js/js.translator/testData/box/inlineMultiFile/builders.kt b/js/js.translator/testData/box/inlineMultiFile/builders.kt
index 518249c554d..960ca289e54 100644
--- a/js/js.translator/testData/box/inlineMultiFile/builders.kt
+++ b/js/js.translator/testData/box/inlineMultiFile/builders.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1661
 /*
  * Copy of JVM-backend test
diff --git a/js/js.translator/testData/box/multideclaration/multiValForMap.kt b/js/js.translator/testData/box/multideclaration/multiValForMap.kt
index 2ea3a107021..518017969dd 100644
--- a/js/js.translator/testData/box/multideclaration/multiValForMap.kt
+++ b/js/js.translator/testData/box/multideclaration/multiValForMap.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1211
 package foo
 
diff --git a/js/js.translator/testData/box/rtti/collectionClassesIsCheck.kt b/js/js.translator/testData/box/rtti/collectionClassesIsCheck.kt
index 867cf9a03d8..2b7736208fe 100644
--- a/js/js.translator/testData/box/rtti/collectionClassesIsCheck.kt
+++ b/js/js.translator/testData/box/rtti/collectionClassesIsCheck.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1557
 // KT-2468 ArrayList<String> is List<String> or HashSet<String> is Set<String> fails in generated JS code
 package foo
diff --git a/js/js.translator/testData/box/standardClasses/hashMapTypeOfElement.kt b/js/js.translator/testData/box/standardClasses/hashMapTypeOfElement.kt
index 1623e4f5d1b..0aa9dd7a0c5 100644
--- a/js/js.translator/testData/box/standardClasses/hashMapTypeOfElement.kt
+++ b/js/js.translator/testData/box/standardClasses/hashMapTypeOfElement.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1284
 package foo
 
diff --git a/js/js.translator/testData/box/standardClasses/hashSetTypeOfElement.kt b/js/js.translator/testData/box/standardClasses/hashSetTypeOfElement.kt
index 369233d103a..83374ae8aa5 100644
--- a/js/js.translator/testData/box/standardClasses/hashSetTypeOfElement.kt
+++ b/js/js.translator/testData/box/standardClasses/hashSetTypeOfElement.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1300
 package foo