function parseMaxStyle(styleValue, node, parentProperty) {
    let valueInPixels;
    if (typeof styleValue === 'string') {
        valueInPixels = parseInt(styleValue, 10);
        if (styleValue.indexOf('%') !== -1) {
            // percentage * size in dimension
            valueInPixels = valueInPixels / 100 * node.parentNode[parentProperty];
        }
    } else {
        valueInPixels = styleValue;
    }
    return valueInPixels;
}
convert max-width/max-height values that may be percentages into a number
@private