diff --git a/src/html/template/context.go b/src/html/template/context.go
index a97c8be56f..c28fb0c5ea 100644
--- a/src/html/template/context.go
+++ b/src/html/template/context.go
@@ -120,6 +120,8 @@ const (
 	stateJSDqStr
 	// stateJSSqStr occurs inside a JavaScript single quoted string.
 	stateJSSqStr
+	// stateJSBqStr occurs inside a JavaScript back quoted string.
+	stateJSBqStr
 	// stateJSRegexp occurs inside a JavaScript regexp literal.
 	stateJSRegexp
 	// stateJSBlockCmt occurs inside a JavaScript /* block comment */.
diff --git a/src/html/template/error.go b/src/html/template/error.go
index 5c51f772cb..d7d6f5b3ab 100644
--- a/src/html/template/error.go
+++ b/src/html/template/error.go
@@ -214,6 +214,19 @@ const (
 	//   pipeline occurs in an unquoted attribute value context, "html" is
 	//   disallowed. Avoid using "html" and "urlquery" entirely in new templates.
 	ErrPredefinedEscaper
+
+	// errJSTmplLit: "... appears in a JS template literal"
+	// Example:
+	//     <script>var tmpl = `{{.Interp}`</script>
+	// Discussion:
+	//   Package html/template does not support actions inside of JS template
+	//   literals.
+	//
+	// TODO(rolandshoemaker): we cannot add this as an exported error in a minor
+	// release, since it is backwards incompatible with the other minor
+	// releases. As such we need to leave it unexported, and then we'll add it
+	// in the next major release.
+	errJSTmplLit
 )
 
 func (e *Error) Error() string {
diff --git a/src/html/template/escape.go b/src/html/template/escape.go
index 54fbcdca33..c20e6b0c34 100644
--- a/src/html/template/escape.go
+++ b/src/html/template/escape.go
@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"fmt"
 	"html"
+	"internal/godebug"
 	"io"
 	"text/template"
 	"text/template/parse"
@@ -160,6 +161,8 @@ func (e *escaper) escape(c context, n parse.Node) context {
 	panic("escaping " + n.String() + " is unimplemented")
 }
 
+var debugAllowActionJSTmpl = godebug.New("jstmpllitinterp")
+
 // escapeAction escapes an action template node.
 func (e *escaper) escapeAction(c context, n *parse.ActionNode) context {
 	if len(n.Pipe.Decl) != 0 {
@@ -223,6 +226,16 @@ func (e *escaper) escapeAction(c context, n *parse.ActionNode) context {
 		c.jsCtx = jsCtxDivOp
 	case stateJSDqStr, stateJSSqStr:
 		s = append(s, "_html_template_jsstrescaper")
+	case stateJSBqStr:
+		if debugAllowActionJSTmpl.Value() == "1" {
+			debugAllowActionJSTmpl.IncNonDefault()
+			s = append(s, "_html_template_jsstrescaper")
+		} else {
+			return context{
+				state: stateError,
+				err:   errorf(errJSTmplLit, n, n.Line, "%s appears in a JS template literal", n),
+			}
+		}
 	case stateJSRegexp:
 		s = append(s, "_html_template_jsregexpescaper")
 	case stateCSS:
diff --git a/src/html/template/escape_test.go b/src/html/template/escape_test.go
index 12add077c3..3dd212bac9 100644
--- a/src/html/template/escape_test.go
+++ b/src/html/template/escape_test.go
@@ -681,35 +681,31 @@ func TestEscape(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		tmpl := New(test.name)
-		tmpl = Must(tmpl.Parse(test.input))
-		// Check for bug 6459: Tree field was not set in Parse.
-		if tmpl.Tree != tmpl.text.Tree {
-			t.Errorf("%s: tree not set properly", test.name)
-			continue
-		}
-		b := new(strings.Builder)
-		if err := tmpl.Execute(b, data); err != nil {
-			t.Errorf("%s: template execution failed: %s", test.name, err)
-			continue
-		}
-		if w, g := test.output, b.String(); w != g {
-			t.Errorf("%s: escaped output: want\n\t%q\ngot\n\t%q", test.name, w, g)
-			continue
-		}
-		b.Reset()
-		if err := tmpl.Execute(b, pdata); err != nil {
-			t.Errorf("%s: template execution failed for pointer: %s", test.name, err)
-			continue
-		}
-		if w, g := test.output, b.String(); w != g {
-			t.Errorf("%s: escaped output for pointer: want\n\t%q\ngot\n\t%q", test.name, w, g)
-			continue
-		}
-		if tmpl.Tree != tmpl.text.Tree {
-			t.Errorf("%s: tree mismatch", test.name)
-			continue
-		}
+		t.Run(test.name, func(t *testing.T) {
+			tmpl := New(test.name)
+			tmpl = Must(tmpl.Parse(test.input))
+			// Check for bug 6459: Tree field was not set in Parse.
+			if tmpl.Tree != tmpl.text.Tree {
+				t.Fatalf("%s: tree not set properly", test.name)
+			}
+			b := new(strings.Builder)
+			if err := tmpl.Execute(b, data); err != nil {
+				t.Fatalf("%s: template execution failed: %s", test.name, err)
+			}
+			if w, g := test.output, b.String(); w != g {
+				t.Fatalf("%s: escaped output: want\n\t%q\ngot\n\t%q", test.name, w, g)
+			}
+			b.Reset()
+			if err := tmpl.Execute(b, pdata); err != nil {
+				t.Fatalf("%s: template execution failed for pointer: %s", test.name, err)
+			}
+			if w, g := test.output, b.String(); w != g {
+				t.Fatalf("%s: escaped output for pointer: want\n\t%q\ngot\n\t%q", test.name, w, g)
+			}
+			if tmpl.Tree != tmpl.text.Tree {
+				t.Fatalf("%s: tree mismatch", test.name)
+			}
+		})
 	}
 }
 
@@ -936,6 +932,10 @@ func TestErrors(t *testing.T) {
 			"{{range .Items}}<a{{if .X}}{{end}}>{{if .X}}{{break}}{{end}}{{end}}",
 			"",
 		},
+		{
+			"<script>var a = `${a+b}`</script>`",
+			"",
+		},
 		// Error cases.
 		{
 			"{{if .Cond}}<a{{end}}",
@@ -1082,6 +1082,10 @@ func TestErrors(t *testing.T) {
 			// html is allowed since it is the last command in the pipeline, but urlquery is not.
 			`predefined escaper "urlquery" disallowed in template`,
 		},
+		{
+			"<script>var tmpl = `asd {{.}}`;</script>",
+			`{{.}} appears in a JS template literal`,
+		},
 	}
 	for _, test := range tests {
 		buf := new(bytes.Buffer)
@@ -1303,6 +1307,10 @@ func TestEscapeText(t *testing.T) {
 			`<a onclick="'foo&quot;`,
 			context{state: stateJSSqStr, delim: delimDoubleQuote, attr: attrScript},
 		},
+		{
+			"<a onclick=\"`foo",
+			context{state: stateJSBqStr, delim: delimDoubleQuote, attr: attrScript},
+		},
 		{
 			`<A ONCLICK="'`,
 			context{state: stateJSSqStr, delim: delimDoubleQuote, attr: attrScript},
diff --git a/src/html/template/js.go b/src/html/template/js.go
index 50523d00f1..fe7054efe5 100644
--- a/src/html/template/js.go
+++ b/src/html/template/js.go
@@ -308,6 +308,7 @@ var jsStrReplacementTable = []string{
 	// Encode HTML specials as hex so the output can be embedded
 	// in HTML attributes without further encoding.
 	'"':  `\u0022`,
+	'`':  `\u0060`,
 	'&':  `\u0026`,
 	'\'': `\u0027`,
 	'+':  `\u002b`,
@@ -331,6 +332,7 @@ var jsStrNormReplacementTable = []string{
 	'"':  `\u0022`,
 	'&':  `\u0026`,
 	'\'': `\u0027`,
+	'`':  `\u0060`,
 	'+':  `\u002b`,
 	'/':  `\/`,
 	'<':  `\u003c`,
diff --git a/src/html/template/js_test.go b/src/html/template/js_test.go
index 580cb0a12d..eee7eb2bef 100644
--- a/src/html/template/js_test.go
+++ b/src/html/template/js_test.go
@@ -291,7 +291,7 @@ func TestEscapersOnLower7AndSelectHighCodepoints(t *testing.T) {
 				`0123456789:;\u003c=\u003e?` +
 				`@ABCDEFGHIJKLMNO` +
 				`PQRSTUVWXYZ[\\]^_` +
-				"`abcdefghijklmno" +
+				"\\u0060abcdefghijklmno" +
 				"pqrstuvwxyz{|}~\u007f" +
 				"\u00A0\u0100\\u2028\\u2029\ufeff\U0001D11E",
 		},
diff --git a/src/html/template/jsctx_string.go b/src/html/template/jsctx_string.go
index dd1d87ee45..23948934c9 100644
--- a/src/html/template/jsctx_string.go
+++ b/src/html/template/jsctx_string.go
@@ -4,6 +4,15 @@ package template
 
 import "strconv"
 
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[jsCtxRegexp-0]
+	_ = x[jsCtxDivOp-1]
+	_ = x[jsCtxUnknown-2]
+}
+
 const _jsCtx_name = "jsCtxRegexpjsCtxDivOpjsCtxUnknown"
 
 var _jsCtx_index = [...]uint8{0, 11, 21, 33}
diff --git a/src/html/template/state_string.go b/src/html/template/state_string.go
index 05104be89c..6fb1a6eeb0 100644
--- a/src/html/template/state_string.go
+++ b/src/html/template/state_string.go
@@ -4,9 +4,42 @@ package template
 
 import "strconv"
 
-const _state_name = "stateTextstateTagstateAttrNamestateAfterNamestateBeforeValuestateHTMLCmtstateRCDATAstateAttrstateURLstateSrcsetstateJSstateJSDqStrstateJSSqStrstateJSRegexpstateJSBlockCmtstateJSLineCmtstateCSSstateCSSDqStrstateCSSSqStrstateCSSDqURLstateCSSSqURLstateCSSURLstateCSSBlockCmtstateCSSLineCmtstateError"
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[stateText-0]
+	_ = x[stateTag-1]
+	_ = x[stateAttrName-2]
+	_ = x[stateAfterName-3]
+	_ = x[stateBeforeValue-4]
+	_ = x[stateHTMLCmt-5]
+	_ = x[stateRCDATA-6]
+	_ = x[stateAttr-7]
+	_ = x[stateURL-8]
+	_ = x[stateSrcset-9]
+	_ = x[stateJS-10]
+	_ = x[stateJSDqStr-11]
+	_ = x[stateJSSqStr-12]
+	_ = x[stateJSBqStr-13]
+	_ = x[stateJSRegexp-14]
+	_ = x[stateJSBlockCmt-15]
+	_ = x[stateJSLineCmt-16]
+	_ = x[stateCSS-17]
+	_ = x[stateCSSDqStr-18]
+	_ = x[stateCSSSqStr-19]
+	_ = x[stateCSSDqURL-20]
+	_ = x[stateCSSSqURL-21]
+	_ = x[stateCSSURL-22]
+	_ = x[stateCSSBlockCmt-23]
+	_ = x[stateCSSLineCmt-24]
+	_ = x[stateError-25]
+	_ = x[stateDead-26]
+}
 
-var _state_index = [...]uint16{0, 9, 17, 30, 44, 60, 72, 83, 92, 100, 111, 118, 130, 142, 155, 170, 184, 192, 205, 218, 231, 244, 255, 271, 286, 296}
+const _state_name = "stateTextstateTagstateAttrNamestateAfterNamestateBeforeValuestateHTMLCmtstateRCDATAstateAttrstateURLstateSrcsetstateJSstateJSDqStrstateJSSqStrstateJSBqStrstateJSRegexpstateJSBlockCmtstateJSLineCmtstateCSSstateCSSDqStrstateCSSSqStrstateCSSDqURLstateCSSSqURLstateCSSURLstateCSSBlockCmtstateCSSLineCmtstateErrorstateDead"
+
+var _state_index = [...]uint16{0, 9, 17, 30, 44, 60, 72, 83, 92, 100, 111, 118, 130, 142, 154, 167, 182, 196, 204, 217, 230, 243, 256, 267, 283, 298, 308, 317}
 
 func (i state) String() string {
 	if i >= state(len(_state_index)-1) {
diff --git a/src/html/template/transition.go b/src/html/template/transition.go
index 06df679330..92eb351906 100644
--- a/src/html/template/transition.go
+++ b/src/html/template/transition.go
@@ -27,6 +27,7 @@ var transitionFunc = [...]func(context, []byte) (context, int){
 	stateJS:          tJS,
 	stateJSDqStr:     tJSDelimited,
 	stateJSSqStr:     tJSDelimited,
+	stateJSBqStr:     tJSDelimited,
 	stateJSRegexp:    tJSDelimited,
 	stateJSBlockCmt:  tBlockCmt,
 	stateJSLineCmt:   tLineCmt,
@@ -262,7 +263,7 @@ func tURL(c context, s []byte) (context, int) {
 
 // tJS is the context transition function for the JS state.
 func tJS(c context, s []byte) (context, int) {
-	i := bytes.IndexAny(s, `"'/`)
+	i := bytes.IndexAny(s, "\"`'/")
 	if i == -1 {
 		// Entire input is non string, comment, regexp tokens.
 		c.jsCtx = nextJSCtx(s, c.jsCtx)
@@ -274,6 +275,8 @@ func tJS(c context, s []byte) (context, int) {
 		c.state, c.jsCtx = stateJSDqStr, jsCtxRegexp
 	case '\'':
 		c.state, c.jsCtx = stateJSSqStr, jsCtxRegexp
+	case '`':
+		c.state, c.jsCtx = stateJSBqStr, jsCtxRegexp
 	case '/':
 		switch {
 		case i+1 < len(s) && s[i+1] == '/':
@@ -303,6 +306,8 @@ func tJSDelimited(c context, s []byte) (context, int) {
 	switch c.state {
 	case stateJSSqStr:
 		specials = `\'`
+	case stateJSBqStr:
+		specials = "`\\"
 	case stateJSRegexp:
 		specials = `\/[]`
 	}
diff --git a/src/runtime/metrics.go b/src/runtime/metrics.go
index 55e3d68c2b..d154acce71 100644
--- a/src/runtime/metrics.go
+++ b/src/runtime/metrics.go
@@ -290,6 +290,7 @@ func initMetrics() {
 		"/godebug/non-default-behavior/http2client:events":          {compute: compute0},
 		"/godebug/non-default-behavior/http2server:events":          {compute: compute0},
 		"/godebug/non-default-behavior/installgoroot:events":        {compute: compute0},
+		"/godebug/non-default-behavior/jstmpllitinterp:events":      {compute: compute0},
 		"/godebug/non-default-behavior/multipartfiles:events":       {compute: compute0},
 		"/godebug/non-default-behavior/multipartmaxheaders:events":  {compute: compute0},
 		"/godebug/non-default-behavior/multipartmaxparts:events":    {compute: compute0},
diff --git a/src/runtime/metrics/description.go b/src/runtime/metrics/description.go
index 65288dea61..a06c017b7f 100644
--- a/src/runtime/metrics/description.go
+++ b/src/runtime/metrics/description.go
@@ -305,6 +305,13 @@ var allDesc = []Description{
 		Kind:       KindUint64,
 		Cumulative: true,
 	},
+	{
+		Name: "/godebug/non-default-behavior/jstmpllitinterp:events",
+		Description: "The number of non-default behaviors executed by the html/template" +
+			"package due to a non-default GODEBUG=jstmpllitinterp=... setting.",
+		Kind:       KindUint64,
+		Cumulative: true,
+	},
 	{
 		Name: "/godebug/non-default-behavior/multipartfiles:events",
 		Description: "The number of non-default behaviors executed by the mime/multipart package " +
diff --git a/src/runtime/metrics/doc.go b/src/runtime/metrics/doc.go
index 4cf528746b..68bbf5a3ce 100644
--- a/src/runtime/metrics/doc.go
+++ b/src/runtime/metrics/doc.go
@@ -219,6 +219,11 @@ Below is the full list of supported metrics, ordered lexicographically.
 		The number of non-default behaviors executed by the go/build
 		package due to a non-default GODEBUG=installgoroot=... setting.
 
+	/godebug/non-default-behavior/jstmpllitinterp:events
+		The number of non-default behaviors executed by
+		the html/templatepackage due to a non-default
+		GODEBUG=jstmpllitinterp=... setting.
+
 	/godebug/non-default-behavior/multipartfiles:events
 		The number of non-default behaviors executed by
 		the mime/multipart package due to a non-default