javascript/atoms/dom.js
function positiveSize(e) {
    var rect = bot.dom.getClientRect(e);
    if (rect.height > 0 && rect.width > 0) {
      return true;
    }
    // A vertical or horizontal SVG Path element will report zero width or
    // height but is "shown" if it has a positive stroke-width.
    if (bot.dom.isElement(e, 'PATH') && (rect.height > 0 || rect.width > 0)) {
      var strokeWidth = bot.dom.getEffectiveStyle(e, 'stroke-width');
      return !!strokeWidth && (parseInt(strokeWidth, 10) > 0);
    }
    // Zero-sized elements should still be considered to have positive size
    // if they have a child element or text node with positive size, unless
    // the element has an 'overflow' style of 'hidden'.
    return bot.dom.getEffectiveStyle(e, 'overflow') != 'hidden' &&
        goog.array.some(e.childNodes, function(n) {
          return n.nodeType == goog.dom.NodeType.TEXT ||
                 (bot.dom.isElement(n) && positiveSize(n));
        });
  }
function positiveSize(e) {
    var rect = bot.dom.getClientRect(e);
    if (rect.height > 0 && rect.width > 0) {
      return true;
    }
    // A vertical or horizontal SVG Path element will report zero width or
    // height but is "shown" if it has a positive stroke-width.
    if (bot.dom.isElement(e, 'PATH') && (rect.height > 0 || rect.width > 0)) {
      var strokeWidth = bot.dom.getEffectiveStyle(e, 'stroke-width');
      return !!strokeWidth && (parseInt(strokeWidth, 10) > 0);
    }
    // Zero-sized elements should still be considered to have positive size
    // if they have a child element or text node with positive size, unless
    // the element has an 'overflow' style of 'hidden'.
    return bot.dom.getEffectiveStyle(e, 'overflow') != 'hidden' &&
        goog.array.some(e.childNodes, function(n) {
          return n.nodeType == goog.dom.NodeType.TEXT ||
                 (bot.dom.isElement(n) && positiveSize(n));
        });
  }
function positiveSize ( e ) { var rect = bot . dom . getClientRect ( e ) ; if ( rect . height > 0 && rect . width > 0 ) { return true ; } // A vertical or horizontal SVG Path element will report zero width or // height but is "shown" if it has a positive stroke-width. if ( bot . dom . isElement ( e , 'PATH' ) && ( rect . height > 0 || rect . width > 0 ) ) { var strokeWidth = bot . dom . getEffectiveStyle ( e , 'stroke-width' ) ; return ! ! strokeWidth && ( parseInt ( strokeWidth , 10 ) > 0 ) ; } // Zero-sized elements should still be considered to have positive size // if they have a child element or text node with positive size, unless // the element has an 'overflow' style of 'hidden'. return bot . dom . getEffectiveStyle ( e , 'overflow' ) != 'hidden' && goog . array . some ( e . childNodes , function ( n ) { return n . nodeType == goog . dom . NodeType . TEXT || ( bot . dom . isElement ( n ) && positiveSize ( n ) ) ; } ) ; }
Any element without positive size dimensions is not shown.
Any element without positive size dimensions is not shown .