diff --git a/internal/driver/chrome/driver_test.go b/internal/driver/chrome/driver_test.go
index a554bf0..1997544 100644
--- a/internal/driver/chrome/driver_test.go
+++ b/internal/driver/chrome/driver_test.go
@@ -2,10 +2,71 @@ package chrome
 
 import (
 	"context"
+	"encoding/json"
 	"testing"
 	"time"
 )
 
+// TestHierarchy_EditableFlag confirms the injected hierarchy script marks text
+// inputs, textareas, and contenteditable elements editable while leaving
+// buttons and non-text inputs alone.
+func TestHierarchy_EditableFlag(t *testing.T) {
+	const html = `<body>` +
+		`<input id="name">` +
+		`<textarea id="bio"></textarea>` +
+		`<button id="go">go</button>` +
+		`<div id="rich" contenteditable="true">x</div>` +
+		`<input id="chk" type="checkbox">` +
+		`</body>`
+
+	d := New()
+	defer d.Terminate(context.Background())
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+	if err := d.Launch(ctx, "data:text/html,"+html, false, nil); err != nil {
+		t.Fatalf("Launch: %v", err)
+	}
+	dump, err := d.Hierarchy(ctx)
+	if err != nil {
+		t.Fatalf("Hierarchy: %v", err)
+	}
+
+	type node struct {
+		Attributes map[string]string `json:"attributes"`
+		Children   []node            `json:"children"`
+		Editable   *bool             `json:"editable"`
+	}
+	var root node
+	if err := json.Unmarshal([]byte(dump), &root); err != nil {
+		t.Fatalf("unmarshal hierarchy: %v", err)
+	}
+	editableByID := map[string]*bool{}
+	var walk func(n node)
+	walk = func(n node) {
+		if id := n.Attributes["resource-id"]; id != "" {
+			editableByID[id] = n.Editable
+		}
+		for _, c := range n.Children {
+			walk(c)
+		}
+	}
+	walk(root)
+
+	isEditable := func(id string) bool {
+		return editableByID[id] != nil && *editableByID[id]
+	}
+	for _, id := range []string{"name", "bio", "rich"} {
+		if !isEditable(id) {
+			t.Errorf("%q: editable = %v, want true", id, editableByID[id])
+		}
+	}
+	for _, id := range []string{"go", "chk"} {
+		if isEditable(id) {
+			t.Errorf("%q: editable = true, want false/absent", id)
+		}
+	}
+}
+
 // TestRunCtx_CallerCancelPropagates confirms that cancelling the caller's
 // context cancels the chromedp-bound context returned by runCtx. This is the
 // channel by which step deadlines and Ctrl-C reach in-flight CDP calls.