Decrease mismatches in feature extraction

heuristics/distillable/extract_features.js

 return (function() {
   function hasOGArticle() {
     var elems = document.head.querySelectorAll(
         'meta[property="og:type"],meta[name="og:type"]');
     for (var i in elems) {
       if (elems[i].content && elems[i].content.toUpperCase() == 'ARTICLE') {
         return true;
       }
     }
     return false;
   }
 
   function isVisible(e) {
     var bounds = e.getBoundingClientRect()
     var style = window.getComputedStyle(e);
     return !(
-      bounds.height == 0 || bounds.width == 0 ||
+      (bounds.height == 0 && bounds.width == 0) ||
       style.display == "none" ||
       style.visibility == "hidden" ||
       style.opacity == 0
     )
   }
 
   function countVisible(nodes) {
     var count = 0;
     for (var i = 0; i < nodes.length; i++) {
       var node = nodes[i];
@@ skipping 61 matching lines @@
      'mozScore': _mozScore(true, 0.5, 140, true, 1e100),
      'mozScoreAllSqrt': _mozScore(true, 0.5, 0, true, 1e100),
      'mozScoreAllLinear': _mozScore(true, 1, 0, true, 1e100),
      'mozScoreFast': _mozScore(false, 0.5, 140, true, 1000),
      'mozScoreFastAllSqrt': _mozScore(false, 0.5, 0, true, 1000),
      'mozScoreFastAllLinear': _mozScore(false, 1, 0, true, 1000),
      'visibleElements': countVisible(body.querySelectorAll('*')),
      'visiblePPRE': countVisible(body.querySelectorAll('p,pre')),
   }
 })()