fenix/app/src/main/res/xml/home_scene.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
<MotionScene
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:motion="http://schemas.android.com/apk/res-auto">

    <Transition
        motion:constraintSetStart="@+id/start"
        motion:constraintSetEnd="@+id/end">
        <OnSwipe
            motion:dragDirection="dragUp"
            motion:touchAnchorId="@id/home_component"
            motion:touchAnchorSide="top" />

        <KeyFrameSet>
            <KeyPosition
                motion:motionTarget="@id/wordmark"
                motion:keyPositionType="pathRelative"
                motion:framePosition="50"
                motion:percentX="0.9" />

            <KeyAttribute
                motion:motionTarget="@id/wordmark"
                motion:framePosition="50"
                android:translationY="0dp"
                android:alpha="1" />
            <KeyAttribute
                motion:motionTarget="@id/wordmark"
                motion:framePosition="90"
                android:alpha="0" />

            <KeyAttribute
                motion:motionTarget="@id/menuButton"
                motion:framePosition="50"
                android:translationY="0dp"
                android:alpha="1" />
            <KeyAttribute
                motion:motionTarget="@id/menuButton"
                motion:framePosition="90"
                android:alpha="0" />
            <KeyAttribute
                motion:motionTarget="@id/privateBrowsingButton"
                motion:framePosition="50"
                android:translationY="0dp"
                android:alpha="1" />
            <KeyAttribute
                motion:motionTarget="@id/privateBrowsingButton"
                motion:framePosition="90"
                android:alpha="0" />

            <KeyAttribute
                motion:motionTarget="@id/homeDividerShadow"
                motion:framePosition="90">
                <CustomAttribute
                    motion:attributeName="layoutMarginStart"
                    motion:customPixelDimension="0dp" />
                <CustomAttribute
                    motion:attributeName="layoutMarginEnd"
                    motion:customPixelDimension="0dp" />
            </KeyAttribute>
            <KeyAttribute
                motion:motionTarget="@id/homeDividerShadow"
                motion:framePosition="90"
                android:alpha="0" />

            <KeyAttribute
                motion:motionTarget="@id/toolbar_wrapper"
                motion:framePosition="0"
                android:elevation="@dimen/toolbar_elevation" />
            <KeyAttribute
                motion:motionTarget="@id/toolbar_wrapper"
                motion:framePosition="50"
                android:elevation="0dp" />

            <KeyTrigger
                motion:motionTarget="@id/toolbar_wrapper"
                motion:framePosition="55"
                motion:onPositiveCross="transitionToDark"
                motion:onNegativeCross="transitionToLight" />

            <KeyTrigger
                motion:motionTarget="@id/toolbar_wrapper"
                motion:framePosition="90"
                motion:onPositiveCross="transitionToDarkNoBorder"
                motion:onNegativeCross="transitionToDarkFromNoBorder" />
        </KeyFrameSet>
    </Transition>

    <ConstraintSet android:id="@+id/start">
    </ConstraintSet>

    <ConstraintSet android:id="@+id/end">
        <Constraint
            android:id="@+id/wordmark"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:alpha="0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:translationY="-10dp"
            motion:layout_constraintStart_toStartOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />

        <Constraint
            android:id="@+id/toolbar_wrapper"
            android:layout_marginTop="16dp"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            motion:layout_constraintTop_toTopOf="parent"
            motion:layout_constraintStart_toStartOf="parent"
            motion:layout_constraintEnd_toEndOf="parent"
            android:elevation="0dp" />

        <Constraint
            android:id="@+id/menuButton"
            android:alpha="0"
            android:visibility="gone"
            android:layout_marginTop="16dp"
            android:translationY="-10dp"
            android:layout_height="@dimen/glyph_button_height"
            android:layout_width="@dimen/glyph_button_height"
            motion:layout_constraintEnd_toEndOf="parent"
            motion:layout_constraintTop_toTopOf="parent"/>

        <Constraint
            android:id="@+id/privateBrowsingButton"
            android:alpha="0"
            android:visibility="gone"
            android:translationY="-10dp"
            android:layout_height="@dimen/glyph_button_height"
            android:layout_width="@dimen/glyph_button_height"
            motion:layout_constraintEnd_toStartOf="@id/menuButton"
            motion:layout_constraintTop_toTopOf="@id/menuButton"/>

        <Constraint
            android:id="@+id/homeDivider"
            android:layout_height="1dp"
            android:alpha="0"
            android:layout_marginStart="0dp"
            android:layout_marginEnd="0dp"
            android:layout_marginTop="8dp"
            motion:layout_constraintTop_toBottomOf="@id/toolbar_wrapper"
            motion:layout_constraintStart_toStartOf="parent"
            motion:layout_constraintEnd_toEndOf="parent" />

        <Constraint
            android:id="@+id/homeDividerShadow"
            android:layout_height="3dp"
            android:alpha="1"
            motion:layout_constraintTop_toBottomOf="@id/homeDivider"
            motion:layout_constraintStart_toStartOf="@+id/homeDivider"
            motion:layout_constraintEnd_toEndOf="@+id/homeDivider" />
    </ConstraintSet>
</MotionScene>