TiddlyWiki

• Column entries with surrounding pipes.
• Header Columns with leading bumps. (it rhymes)
• Column span with "greater then" (it rhymes)
• Row span a tilde can (it rhymes)
• Analogue aligning

var btn = document.getElementById("mybtn");
btn.old_onclick = btn.onclick;
btn.onclick = function() {
    this.old_onclick.apply(this,arguments);
    alert("goodbye");
}