64 lines
1.9 KiB
HTML
64 lines
1.9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>5.2.3 SpeechSynthesisUtterance volume attribute test - Manual</title>
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<style>
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div,
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#test {
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display: block;
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width: 640px;
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word-break: break-all;
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padding: 4px;
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}
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#test,
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#volume {
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background: skyblue;
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font-weight: bold;
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}
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</style>
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<script>
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const text = "hello universe";
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const volumes = [0, 0.2, 0.4, 0.6, 1];
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handleVoicesChanged = async _ => {
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for (const volume of volumes) {
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await new Promise(resolve => {
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document.getElementById("volume").value = volume;
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const utterance = new SpeechSynthesisUtterance();
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utterance.text = text;
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utterance.volume = volume;
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utterance.onend = resolve;
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window.speechSynthesis.speak(utterance);
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});
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};
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};
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onload = e => {
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document.getElementById("test").onclick = _ => {
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if (window.speechSynthesis.getVoices().length === 0) {
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window.speechSynthesis.onvoiceschanged = handleVoicesChanged;
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} else {
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handleVoicesChanged()
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}
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};
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};
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</script>
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</head>
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<body>
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<div>
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<h3>Specification:</h3>
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<a href="https://w3c.github.io/speech-api/speechapi.html#utterance-attributes"><b><code><i><u>volume</u></i></code> attribute</b></a>
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<blockquote>
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This attribute specifies the speaking volume for the utterance. It ranges between 0 and 1 inclusive, with 0 being the lowest volume and 1 the highest volume, with a default of 1. If SSML is used, this value will be overridden by prosody tags in the markup.
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</blockquote>
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</div>
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<div id="test">
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Click to execute <code>window.speechSynthesis.speak()</code> with <code>volume attribute</code> set to <code>0, 0.2, 0.4, 0.6, 1.</code>
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</div>
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<br>
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<div>
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<label for="volume">Current volume: </label>
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<input id="volume" readonly>
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<h3>Manaul Test:</h3>Does the volume of audio output change?
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</div>
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</body>
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</html>
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