espeak-ng/docs/ssml.md

TEXT MARKUP

SSML: Speech Synthesis Markup Language

The following markup tags and attributes are recognised:

<speak>

<voice>

---

<prosody>

---

<say-as>

---

<mark> name

<s>

<p>

<sub> alias

<tts:style>

<audio> src

<emphasis>

<break>

HTML

eSpeak can speak HTML text directly, or text containing both SSML and HTML markup.
Any unrecognised tags are ignored.

The following tags case a sentence break.
**<br>   <dd>   <li>   <img>   <td>  **

The following tags case a paragraph break.
**<h1>   <h2>   <h3>   <h4>   <hr>  **

Text between the following tags is ignored.
**<script>   ...   </script>  
<style>   ...   </style>  **