Macro audio 

macro_rules! audio {
    ($($all:tt)*) => { ... };
}

Example

use rtml::*;

assert_eq!(
    audio![.src="example.mp3"].render(),
    "<audio src=\"example.mp3\">"
);

assert_eq!(
    audio![.src="example.mp3", .controls = "true"].render(),
    "<audio src=\"example.mp3\" controls=\"true\">"
);