<speak>
Here are <say-as interpret-as="characters">SSML</say-as> samples.
I can pause <break time="3s"/>.
I can play a sound
<audio src="https://www.example.com/MY_MP3_FILE.mp3">didn't get your MP3 audio file</audio>.
I can speak in cardinals. Your number is <say-as interpret-as="cardinal">10</say-as>.
Or I can speak in ordinals. You are <say-as interpret-as="ordinal">10</say-as> in line.
Or I can even speak in digits. The digits for ten are <say-as interpret-as="characters">10</say-as>.
I can also substitute phrases, like the <sub alias="World Wide Web Consortium">W3C</sub>.
Finally, I can speak a paragraph with two sentences.
<p><s>This is sentence one.</s><s>This is sentence two.</s></p>
</speak>