# SSML and HTML Support

- SSML (Speech Synthesis Markup Language)
  - speak
  - voice
  - prosody
  - say-as
  - mark
  - s
  - p
  - sub
  - tts:style
  - audio
  - emphasis
  - break
- HTML
- References
  - SSML
  - HTML

## SSML (Speech Synthesis Markup Language)

SSML consists of XML-like tags, for example: `Did you mean the <emphasis level="strong"><prosody pitch="75">green</prosody></emphasis> beans?`

The following markup tags and attributes are recognised:

### speak

- xml:base (the value is just passed back as a parameter with the UriCallback() function)
- xml:lang

### voice

- xml:lang
- name
- age
- variant
- gender

### prosody

- rate (`x-slow`, `slow`, `medium`, `fast`, `x-fast` or a percentage such as `125%`)
- volume (`silent`, `x-soft`, `soft`, `medium`, `loud`, `x-loud`, `+1dB` or `-1dB`)
- pitch (a number, for example “75”)
- range (`default`, `x-low`, `low`, `medium`, `high`, `x-high`)

### say-as

- interpret-as=“characters”
- interpret-as=“characters” format=“glyphs”
- interpret-as=“tts:key”
- interpret-as=“tts:char”
- interpret-as=“tts:digits”

### mark

- name

### s

- xml:lang

### p

- xml:lang

### sub

- alias

### tts:style

- field=“punctuation” mode=none,all,some
- field=“capital_letters” mode=no,spelling,icon,pitch

### audio

- src

### emphasis

- level (`none`, `reduced`, `moderate`, `strong` or `x-strong`)

### break

- strength
- time

## HTML

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

The following tags cause a sentence break:

- `br`
- `dd`
- `li`
- `img`
- `td`

The following tags cause a paragraph break:

- `h1`
- `h2`
- `h3`
- `h4`
- `hr`

Text between the following tags is ignored:

- `script`
- `style`

## References

### SSML

1. Speech Synthesis Markup Language (SSML) Version 1.0. W3C Recommendation, 3 March 2009. W3C.
2. Speech Synthesis Markup Language (SSML) Version 1.1. W3C Recommendation, 7 September 2010. W3C.
3. SSML 1.0 say-as attribute values. W3C NOTE, 26 May 2005. W3C.

### HTML

1. HTML 5.2. W3C Recommendation, 14 December 2017. W3C.
2. HTML Living Standard. Continually updated. WHATWG.