diff --git a/cdp/page/easyjson.go b/cdp/page/easyjson.go
index 6048c80..6a3171e 100644
--- a/cdp/page/easyjson.go
+++ b/cdp/page/easyjson.go
@@ -6,6 +6,7 @@ import (
 	json "encoding/json"
 	cdp "github.com/knq/chromedp/cdp"
 	debugger "github.com/knq/chromedp/cdp/debugger"
+	dom "github.com/knq/chromedp/cdp/dom"
 	easyjson "github.com/mailru/easyjson"
 	jlexer "github.com/mailru/easyjson/jlexer"
 	jwriter "github.com/mailru/easyjson/jwriter"
@@ -1717,6 +1718,8 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpPage21(in *jlexer.Lexer, out *
 		switch key {
 		case "url":
 			out.URL = string(in.String())
+		case "referrer":
+			out.Referrer = string(in.String())
 		default:
 			in.SkipRecursive()
 		}
@@ -1737,6 +1740,14 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpPage21(out *jwriter.Writer, in
 	first = false
 	out.RawString("\"url\":")
 	out.String(string(in.URL))
+	if in.Referrer != "" {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"referrer\":")
+		out.String(string(in.Referrer))
+	}
 	out.RawByte('}')
 }
 
@@ -2454,6 +2465,16 @@ func easyjsonC5a4559bDecodeGithubComKnqChromedpCdpPage30(in *jlexer.Lexer, out *
 				}
 				(*out.VisualViewport).UnmarshalEasyJSON(in)
 			}
+		case "contentSize":
+			if in.IsNull() {
+				in.Skip()
+				out.ContentSize = nil
+			} else {
+				if out.ContentSize == nil {
+					out.ContentSize = new(dom.Rect)
+				}
+				(*out.ContentSize).UnmarshalEasyJSON(in)
+			}
 		default:
 			in.SkipRecursive()
 		}
@@ -2492,6 +2513,18 @@ func easyjsonC5a4559bEncodeGithubComKnqChromedpCdpPage30(out *jwriter.Writer, in
 			(*in.VisualViewport).MarshalEasyJSON(out)
 		}
 	}
+	if in.ContentSize != nil {
+		if !first {
+			out.RawByte(',')
+		}
+		first = false
+		out.RawString("\"contentSize\":")
+		if in.ContentSize == nil {
+			out.RawString("null")
+		} else {
+			(*in.ContentSize).MarshalEasyJSON(out)
+		}
+	}
 	out.RawByte('}')
 }
 
diff --git a/cdp/page/page.go b/cdp/page/page.go
index cea8126..d63c142 100644
--- a/cdp/page/page.go
+++ b/cdp/page/page.go
@@ -15,6 +15,7 @@ import (
 
 	cdp "github.com/knq/chromedp/cdp"
 	"github.com/knq/chromedp/cdp/debugger"
+	"github.com/knq/chromedp/cdp/dom"
 )
 
 // EnableParams enables page domain notifications.
@@ -160,7 +161,8 @@ func (p *ReloadParams) Do(ctxt context.Context, h cdp.Handler) (err error) {
 
 // NavigateParams navigates current page to the given URL.
 type NavigateParams struct {
-	URL string `json:"url"` // URL to navigate the page to.
+	URL      string `json:"url"`                // URL to navigate the page to.
+	Referrer string `json:"referrer,omitempty"` // Referrer URL.
 }
 
 // Navigate navigates current page to the given URL.
@@ -173,6 +175,12 @@ func Navigate(url string) *NavigateParams {
 	}
 }
 
+// WithReferrer referrer URL.
+func (p NavigateParams) WithReferrer(referrer string) *NavigateParams {
+	p.Referrer = referrer
+	return &p
+}
+
 // NavigateReturns return values.
 type NavigateReturns struct {
 	FrameID cdp.FrameID `json:"frameId,omitempty"` // Frame id that will be navigated.
@@ -795,6 +803,7 @@ func GetLayoutMetrics() *GetLayoutMetricsParams {
 type GetLayoutMetricsReturns struct {
 	LayoutViewport *LayoutViewport `json:"layoutViewport,omitempty"` // Metrics relating to the layout viewport.
 	VisualViewport *VisualViewport `json:"visualViewport,omitempty"` // Metrics relating to the visual viewport.
+	ContentSize    *dom.Rect       `json:"contentSize,omitempty"`    // Size of scrollable area.
 }
 
 // Do executes Page.getLayoutMetrics against the provided context and
@@ -803,13 +812,14 @@ type GetLayoutMetricsReturns struct {
 // returns:
 //   layoutViewport - Metrics relating to the layout viewport.
 //   visualViewport - Metrics relating to the visual viewport.
-func (p *GetLayoutMetricsParams) Do(ctxt context.Context, h cdp.Handler) (layoutViewport *LayoutViewport, visualViewport *VisualViewport, err error) {
+//   contentSize - Size of scrollable area.
+func (p *GetLayoutMetricsParams) Do(ctxt context.Context, h cdp.Handler) (layoutViewport *LayoutViewport, visualViewport *VisualViewport, contentSize *dom.Rect, err error) {
 	// execute
 	var res GetLayoutMetricsReturns
 	err = h.Execute(ctxt, cdp.CommandPageGetLayoutMetrics, nil, &res)
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 
-	return res.LayoutViewport, res.VisualViewport, nil
+	return res.LayoutViewport, res.VisualViewport, res.ContentSize, nil
 }
diff --git a/cmd/chromedp-gen/protocol.json b/cmd/chromedp-gen/protocol.json
index c2848da..5226151 100644
--- a/cmd/chromedp-gen/protocol.json
+++ b/cmd/chromedp-gen/protocol.json
@@ -522,6 +522,13 @@
               "name": "url",
               "type": "string",
               "description": "URL to navigate the page to."
+            },
+            {
+              "name": "referrer",
+              "type": "string",
+              "optional": true,
+              "experimental": true,
+              "description": "Referrer URL."
             }
           ],
           "returns": [
@@ -1092,6 +1099,11 @@
               "name": "visualViewport",
               "$ref": "VisualViewport",
               "description": "Metrics relating to the visual viewport."
+            },
+            {
+              "name": "contentSize",
+              "$ref": "DOM.Rect",
+              "description": "Size of scrollable area."
             }
           ]
         }