custom_step.php

    /**
     * See if the element (name|label|id) is greater than the % of the window
     *
     * @Then /^the element "([^"]*)" should be "([^"]*)" percent or greater than the window$/
     */
    public function theElementShouldBePercentOrGreaterThanTheWindow($arg1, $arg2)
    {
        //1. make sure the target exists
        //2. get the height of the target
        //3. compare it to the window height
        //4. fail if < percent given

        $element = $this->getMainContext()->getSession()->getPage()->find('css', $arg1);
        if($element) {
            $javascipt = <<<HEREDOC
        var target = jQuery('$arg1').height();
        var window_height = jQuery(window).height();
        var totalOf = target / window_height * 100;
        if( totalOf >= $arg2 ) { return "PASSES"; } else { return "FAILED"; }
HEREDOC;
            $results = $this->getMainContext()->getSession()->evaluateScript($javascipt);
            if($results == "FAILED") {
                throw new Exception('Element not found');
            }
        } else {
            throw new Exception('Element not found');
        }
    }