gistfile1.js

function svgWarning() {
    // SVG test taken from Modernizr 2.0
    if (!!document.createElementNS &&
        !!document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect)
        return;
    // No SVG, do something about it.
    document.getElementById('mywarningdiv').style.display = 'block'
}