LabelHtml.xaml

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="Xamarin.Forms.Xaml.UnitTests.LabelHtml">
    <StackLayout>
        <Label x:Name="label0"
                TextType="Html">
            &lt;h1&gt;Hello World!&lt;/h1&gt;&lt;br/&gt;SecondLine
        </Label>
        <Label x:Name="label1"
                TextType="Html"
                Text="&lt;h1&gt;Hello World!&lt;/h1&gt;&lt;br/&gt;SecondLine" />
        <Label x:Name="label2"
                TextType="Html">
            <![CDATA[
                <h1>Hello World!</h1><br/>SecondLine
            ]]>
        </Label>
        <Label x:Name="label3"
                TextType="Html">
            <x:String>
                <![CDATA[
                    <h1>Hello World!</h1><br/>SecondLine
                ]]>
            </x:String>
        </Label>
        <Label x:Name="label4"
                TextType="Html">
            <Label.Text>
                <![CDATA[
                    <h1>Hello World!</h1><br/>SecondLine
                ]]>
            </Label.Text>
        </Label>
    </StackLayout>
</ContentPage>