tachiyomi/app/src/main/res/layout/webview_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="?attr/actionBarTheme"
            app:layout_scrollFlags="scroll|enterAlways|snap"
            app:navigationIcon="@drawable/ic_close_24dp" />

    </com.google.android.material.appbar.AppBarLayout>

    <eu.kanade.tachiyomi.widget.ThemedSwipeRefreshLayout
        android:id="@id/swipe_refresh"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <androidx.core.widget.NestedScrollView
            android:id="@+id/nested_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <WebView
                android:id="@+id/webview"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <ProgressBar
                    android:id="@+id/progress_bar"
                    style="?android:attr/progressBarStyleHorizontal"
                    android:layout_width="match_parent"
                    android:layout_height="2dp"
                    android:progressBackgroundTint="@color/colorPrimary"
                    android:progressTint="@color/colorPrimary" />

            </WebView>

        </androidx.core.widget.NestedScrollView>

    </eu.kanade.tachiyomi.widget.ThemedSwipeRefreshLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>