Find all text nodes in HTML page

Based on @kennebec's answer, a slightly tighter implementation of the same logic:

function textNodesUnder(node){
  var all = [];
  for (node=node.firstChild;node;node=node.nextSibling){
    if (node.nodeType==3) all.push(node);
    else all = all.concat(textNodesUnder(node));
  }
  return all;
}

However, far faster, tighter, and more elegant is using createTreeWalker so that the browser filters out everything but the text nodes for you:

function textNodesUnder(el){
  var n, a=[], walk=document.createTreeWalker(el,NodeFilter.SHOW_TEXT,null,false);
  while(n=walk.nextNode()) a.push(n);
  return a;
}

function deepText(node){
    var A= [];
    if(node){
        node= node.firstChild;
        while(node!= null){
            if(node.nodeType== 3) A[A.length]=node;
            else A= A.concat(deepText(node));
            node= node.nextSibling;
        }
    }
    return A;
}