body {
  volume: 50;
  speak: normal;
  azimuth: 0deg;
  elevation: level;
  speech-rate: medium;
  voice-family: female, male;
  pitch: medium;
  pitch-range: 50;
  stress: 50;
  richness: 50;
  speak-numeral: continuous;
}
b, strong, em {
  pitch-range: 65;
  stress: 65;
  richness: 65;
}
b, strong {
  volume: 60;
}
em {
  volume: 55;
}
h1 {
  pause-before: 200%;
}
h2, h3, th {
  pause-before: 100%;
}
h4, h5, h6 {
  pause-before: 50%;
}
.silent {
  volume: silent;
  speak: none;
}
.louder {
  volume: loud;
}
.spell {
  speak: spell-out;
  speech-rate: slower;
}
.spell-num {
  speak: spell-out;
  speech-rate: slower;
  speak-numeral: digits;
}
.spell-all {
  speak: spell-out;
  speech-rate: slower;
  speak-punctuation: code;
  speak-numeral: digits;
}