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:id="@+id/web_view_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical">

    <com.google.android.material.appbar.AppBarLayout
        android:orientation="vertical"
        android:id="@+id/web_linear_layout"
        android:layout_width="match_parent"
        android:fitsSystemWindows="true"
        android:layout_height="wrap_content">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorSecondary"
            android:theme="?attr/actionBarTheme"
            app:navigationIcon="@drawable/ic_close_24dp"
            app:layout_scrollFlags="scroll|enterAlways" />

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

    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        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">
        <WebView
            android:id="@+id/webview"
            android:nestedScrollingEnabled="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

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

    </androidx.core.widget.NestedScrollView>

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>