diff --git a/compiler/natives/src/encoding/gob/gob.go b/compiler/natives/src/encoding/gob/gob.go
new file mode 100644
index 000000000..f21315171
--- /dev/null
+++ b/compiler/natives/src/encoding/gob/gob.go
@@ -0,0 +1,40 @@
+//go:build js
+// +build js
+
+package gob
+
+import (
+	"reflect"
+	"sync"
+)
+
+type typeInfo struct {
+	id      typeId
+	encInit sync.Mutex
+
+	// temporarily replacement of atomic.Pointer[encEngine] for go1.20 without generics.
+	encoder atomicEncEnginePointer
+	wire    *wireType
+}
+
+type atomicEncEnginePointer struct {
+	v *encEngine
+}
+
+func (x *atomicEncEnginePointer) Load() *encEngine     { return x.v }
+func (x *atomicEncEnginePointer) Store(val *encEngine) { x.v = val }
+
+// temporarily replacement of growSlice[E any] for go1.20 without generics.
+func growSlice(v reflect.Value, ps any, length int) {
+	vps := reflect.ValueOf(ps)
+	vs := vps.Elem()
+	zero := reflect.Zero(vs.Elem().Type())
+	vs.Set(reflect.Append(vs, zero))
+	cp := vs.Cap()
+	if cp > length {
+		cp = length
+	}
+	vs.Set(vs.Slice(0, cp))
+	v.Set(vs)
+	vps.Set(vs.Addr())
+}
diff --git a/compiler/natives/src/go/token/position.go b/compiler/natives/src/go/token/position.go
index 6a1ee0c15..436c48380 100644
--- a/compiler/natives/src/go/token/position.go
+++ b/compiler/natives/src/go/token/position.go
@@ -20,3 +20,11 @@ type atomicFilePointer struct {
 
 func (x *atomicFilePointer) Load() *File     { return x.v }
 func (x *atomicFilePointer) Store(val *File) { x.v = val }
+
+func (x *atomicFilePointer) CompareAndSwap(old, new *File) bool {
+	if x.v == old {
+		x.v = new
+		return true
+	}
+	return false
+}
diff --git a/compiler/natives/src/internal/coverage/slicereader/slicereader.go b/compiler/natives/src/internal/coverage/slicereader/slicereader.go
new file mode 100644
index 000000000..71409c5b9
--- /dev/null
+++ b/compiler/natives/src/internal/coverage/slicereader/slicereader.go
@@ -0,0 +1,12 @@
+//go:build js
+// +build js
+
+package slicereader
+
+func toString(b []byte) string {
+	if len(b) == 0 {
+		return ``
+	}
+	// Overwritten to avoid `unsafe.String`
+	return string(b)
+}
diff --git a/compiler/natives/src/internal/godebug/godebug.go b/compiler/natives/src/internal/godebug/godebug.go
new file mode 100644
index 000000000..a303bed67
--- /dev/null
+++ b/compiler/natives/src/internal/godebug/godebug.go
@@ -0,0 +1,95 @@
+//go:build js
+// +build js
+
+package godebug
+
+import (
+	"sync"
+)
+
+type Setting struct {
+	name string
+	once sync.Once
+
+	// temporarily replacement of atomic.Pointer[string] for go1.20 without generics.
+	value *atomicStringPointer
+}
+
+type atomicStringPointer struct {
+	v *string
+}
+
+func (x *atomicStringPointer) Load() *string     { return x.v }
+func (x *atomicStringPointer) Store(val *string) { x.v = val }
+
+func (s *Setting) Value() string {
+	s.once.Do(func() {
+		v, ok := cache.Load(s.name)
+		if !ok {
+			// temporarily replacement of atomic.Pointer[string] for go1.20 without generics.
+			p := new(atomicStringPointer)
+			p.Store(&empty)
+			v, _ = cache.LoadOrStore(s.name, p)
+		}
+		// temporarily replacement of atomic.Pointer[string] for go1.20 without generics.
+		s.value = v.(*atomicStringPointer)
+	})
+	return *s.value.Load()
+}
+
+// setUpdate is provided by package runtime.
+// It calls update(def, env), where def is the default GODEBUG setting
+// and env is the current value of the $GODEBUG environment variable.
+// After that first call, the runtime calls update(def, env)
+// again each time the environment variable changes
+// (due to use of os.Setenv, for example).
+//
+// GOPHERJS: Currently we don't inject a proxy into process.env to watch
+// for changes via syscall.runtimeSetenv and syscall.runtimeUnsetenv.
+// We may want to look into this in the future.
+func setUpdate(update func(string, string)) {}
+
+func update(def, env string) {
+	updateMu.Lock()
+	defer updateMu.Unlock()
+
+	did := make(map[string]bool)
+	parse(did, env)
+	parse(did, def)
+
+	cache.Range(func(name, v any) bool {
+		if !did[name.(string)] {
+			// temporarily replacement of atomic.Pointer[string] for go1.20 without generics.
+			v.(*atomicStringPointer).Store(&empty)
+		}
+		return true
+	})
+}
+
+func parse(did map[string]bool, s string) {
+	end := len(s)
+	eq := -1
+	for i := end - 1; i >= -1; i-- {
+		if i == -1 || s[i] == ',' {
+			if eq >= 0 {
+				name, value := s[i+1:eq], s[eq+1:end]
+				if !did[name] {
+					did[name] = true
+					v, ok := cache.Load(name)
+					if !ok {
+						// temporarily replacement of atomic.Pointer[string] for go1.20 without generics.
+						p := new(atomicStringPointer)
+						p.Store(&empty)
+						v, _ = cache.LoadOrStore(name, p)
+					}
+					// temporarily replacement of atomic.Pointer[string] for go1.20 without generics.
+					v.(*atomicStringPointer).Store(&value)
+				}
+			}
+			eq = -1
+			end = i
+		} else if s[i] == '=' {
+			eq = i
+		}
+	}
+}
diff --git a/compiler/natives/src/math/rand/rand.go b/compiler/natives/src/math/rand/rand.go
new file mode 100644
index 000000000..0dfb1b279
--- /dev/null
+++ b/compiler/natives/src/math/rand/rand.go
@@ -0,0 +1,9 @@
+//go:build js
+// +build js
+
+package rand
+
+import _ "unsafe"
+
+//go:linkname fastrand64 runtime.fastrand64
+func fastrand64() uint64
diff --git a/compiler/natives/src/net/http/client_test.go b/compiler/natives/src/net/http/client_test.go
index 302b800df..b3739fc09 100644
--- a/compiler/natives/src/net/http/client_test.go
+++ b/compiler/natives/src/net/http/client_test.go
@@ -6,14 +6,14 @@ import (
 	"testing"
 )
 
-func testClientTimeout(t *testing.T, h2 bool) {
+func testClientTimeout(t *testing.T, mode testMode) {
 	// The original test expects Client.Timeout error to be returned, but under
 	// GopherJS an "i/o timeout" error is frequently returned. Otherwise the test
 	// seems to be working correctly.
 	t.Skip("Flaky test under GopherJS.")
 }
 
-func testClientTimeout_Headers(t *testing.T, h2 bool) {
+func testClientTimeout_Headers(t *testing.T, mode testMode) {
 	// The original test expects Client.Timeout error to be returned, but under
 	// GopherJS an "i/o timeout" error is frequently returned. Otherwise the test
 	// seems to be working correctly.
diff --git a/compiler/natives/src/net/http/clientserver_test.go b/compiler/natives/src/net/http/clientserver_test.go
index 35b44dd4d..39f1a2d73 100644
--- a/compiler/natives/src/net/http/clientserver_test.go
+++ b/compiler/natives/src/net/http/clientserver_test.go
@@ -7,10 +7,10 @@ import (
 	"testing"
 )
 
-func testTransportGCRequest(t *testing.T, h2, body bool) {
+func testTransportGCRequest(t *testing.T, mode testMode, body bool) {
 	t.Skip("The test relies on runtime.SetFinalizer(), which is not supported by GopherJS.")
 }
 
-func testWriteHeaderAfterWrite(t *testing.T, h2, hijack bool) {
+func testWriteHeaderAfterWrite(t *testing.T, mode testMode, hijack bool) {
 	t.Skip("GopherJS source maps don't preserve original function names in stack traces, which this test relied on.")
 }
diff --git a/compiler/natives/src/net/http/http.go b/compiler/natives/src/net/http/http.go
index 8fd607c4d..f82c0363c 100644
--- a/compiler/natives/src/net/http/http.go
+++ b/compiler/natives/src/net/http/http.go
@@ -6,10 +6,15 @@ package http
 import (
 	"bufio"
 	"bytes"
+	"context"
+	"crypto/tls"
 	"errors"
 	"io"
+	"net"
 	"net/textproto"
 	"strconv"
+	"sync"
+	"sync/atomic"
 
 	"github.com/gopherjs/gopherjs/js"
 )
@@ -113,3 +118,30 @@ func (t *XHRTransport) CancelRequest(req *Request) {
 		xhr.Call("abort")
 	}
 }
+
+type conn struct {
+	server     *Server
+	cancelCtx  context.CancelFunc
+	rwc        net.Conn
+	remoteAddr string
+	tlsState   *tls.ConnectionState
+	werr       error
+	r          *connReader
+	bufr       *bufio.Reader
+	bufw       *bufio.Writer
+	lastMethod string
+
+	// temporarily replacement of `atomic.Pointer[response]` for go1.20 without generics.
+	curReq atomicResponsePointer
+
+	curState  atomic.Uint64
+	mu        sync.Mutex
+	hijackedv bool
+}
+
+type atomicResponsePointer struct {
+	v *response
+}
+
+func (x *atomicResponsePointer) Load() *response     { return x.v }
+func (x *atomicResponsePointer) Store(val *response) { x.v = val }
diff --git a/compiler/natives/src/strings/strings_test.go b/compiler/natives/src/strings/strings_test.go
index fb9a4a57a..3b0775e63 100644
--- a/compiler/natives/src/strings/strings_test.go
+++ b/compiler/natives/src/strings/strings_test.go
@@ -18,5 +18,9 @@ func TestCompareStrings(t *testing.T) {
 }
 
 func TestClone(t *testing.T) {
-	t.Skip("conversion to reflect.StringHeader is not supported in GopherJS")
+	t.Skip("conversion to unsafe.StringData is not supported in GopherJS")
+}
+
+func TestMap(t *testing.T) {
+	t.Skip("identity test uses unsafe.StringData is not supported in GopherJS")
 }
diff --git a/compiler/natives/src/sync/atomic/atomic.go b/compiler/natives/src/sync/atomic/atomic.go
index 1cbfe65f9..d993f3b80 100644
--- a/compiler/natives/src/sync/atomic/atomic.go
+++ b/compiler/natives/src/sync/atomic/atomic.go
@@ -221,5 +221,19 @@ func sameType(x, y interface{}) bool {
 	return js.InternalObject(x).Get("constructor") == js.InternalObject(y).Get("constructor")
 }
 
-//gopherjs:purge for go1.19 without generics
+// Override pointer so that the type check in the source code is satisfied
+// but remove the fields and methods for go1.20 without generics.
+// See https://cs.opensource.google/go/go/+/refs/tags/go1.20.14:src/sync/atomic/type.go;l=40
 type Pointer[T any] struct{}
+
+//gopherjs:purge for go1.20 without generics
+func (x *Pointer[T]) Load() *T
+
+//gopherjs:purge for go1.20 without generics
+func (x *Pointer[T]) Store(val *T)
+
+//gopherjs:purge for go1.20 without generics
+func (x *Pointer[T]) Swap(new *T) (old *T)
+
+//gopherjs:purge for go1.20 without generics
+func (x *Pointer[T]) CompareAndSwap(old, new *T) (swapped bool)
diff --git a/compiler/natives/src/syscall/syscall_js_wasm.go b/compiler/natives/src/syscall/syscall_js_wasm.go
index 5bcbdeed4..7ee92342e 100644
--- a/compiler/natives/src/syscall/syscall_js_wasm.go
+++ b/compiler/natives/src/syscall/syscall_js_wasm.go
@@ -22,6 +22,14 @@ func runtime_envs() []string {
 	return envs
 }
 
+func runtimeSetenv(k, v string) {
+	setenv_c(k, v)
+}
+
+func runtimeUnsetenv(k string) {
+	unsetenv_c(k)
+}
+
 func setenv_c(k, v string) {
 	process := js.Global().Get("process")
 	if process.IsUndefined() {
diff --git a/compiler/natives/src/time/export_test.go b/compiler/natives/src/time/export_test.go
new file mode 100644
index 000000000..edcbb9324
--- /dev/null
+++ b/compiler/natives/src/time/export_test.go
@@ -0,0 +1,7 @@
+//go:build js
+// +build js
+
+package time
+
+// replaced for go1.20 temporarily without generics.
+var ParseRFC3339 = parseRFC3339