The right way to use SSML with Web Speech API

Question

Web Speech API specification says:

text attribute
This attribute specifies the text to be synthesized and spoken for thi

Answer 1

In Chrome 46, the XML is being interpreted properly as an XML document, on Windows, when the language is set to en; however, I see no evidence that the tags are actually doing anything. I heard no difference between the and non- versions of this SSML:

var msg = new SpeechSynthesisUtterance();
msg.text = '\r\nWelcome to the Bird Seed Emporium.  Welcome to the Bird Seed Emporium.';
msg.lang = 'en';
speechSynthesis.speak(msg);

The tag was also completely ignored, which made my attempt to speak IPA fail.

var msg = new SpeechSynthesisUtterance();
msg.text='  Pavlova is a meringue-based dessert named after the Russian ballerina Anna Pavlova. It is a meringue cake with a crisp crust and soft, light inside, usually topped with fruit and, optionally, whipped cream.  The name is pronounced ... or ..., unlike the name of the dancer, which was ... ';
msg.lang = 'en';
speechSynthesis.speak(msg);

This is despite the fact that the Microsoft speech API does handle SSML correctly. Here is a C# snippet, suitable for use in LinqPad:

var str = "Pavlova is a meringue-based dessert named after the Russian ballerina Anna Pavlova. It is a meringue cake with a crisp crust and soft, light inside, usually topped with fruit and, optionally, whipped cream.  The name is pronounced /pævˈloʊvə/ or /pɑːvˈloʊvə/, unlike the name of the dancer, which was /ˈpɑːvləvə/.";
var regex = new Regex("/([^/]+)/");
if (regex.IsMatch(str))
{
    str = regex.Replace(str, "word");
    str.Dump();
}   
SpeechSynthesizer synth = new SpeechSynthesizer();
PromptBuilder pb = new PromptBuilder();
pb.AppendSsmlMarkup(str);
synth.Speak(pb);