CSS Selectors with html5

test.php

<?php
<<<CONFIG
packages:
    - "masterminds/html5: 2.*@dev"
    - "symfony/css-selector: ~2.3"
CONFIG;

/**
 * Run this script with melody (http://melody.sensiolabs.org/): 
 * 
 * melody run https://gist.github.com/jakzal/f7bd31de667e61507925
 */

use Masterminds\HTML5;
use Symfony\Component\CssSelector\CssSelector;

$html = new HTML5();
$dom = $html->loadHTML(file_get_contents('http://www.cascade-framework.com/'));

$expression = CssSelector::toXPath('.highlights .cell');
$xpath = new DOMXpath($dom);
$elements = $xpath->query($expression);
// echo $html->saveHTML($dom);
echo $html->saveHTML($elements);