I18N Matter for Progress:
The spec says :
valueattribute is omitted, then user agents must also parse the
progresselement in question using the steps for finding one or two numbers in a string . These steps will return nothing, one number, one number with a denominator punctuation character, or two numbers."
In Step for finding one or two number
It's only look for 0-9 number.
So what about number in other languages ?
So why not forcing use of <code>m</code> element for numbers
<progress><m>30</m> out of <m>45</m></progress>
in that case m has to be a number in whatever encoding even in RTL it will be parsable