HTML5 Question on using custom index files

[aarware]

Is there predefined placeholders that can be used inside of a custom index.html file for Html5 builds that would replace the page title, canvas height and width and script src?

something like

<title>%Game_Title%</title>
<canvas id="canvas" width="%Canvas_Width%" height="%Canvas_Height%">
<script type="text/javascript" src="%Game_Src%"></script>


Thanks