[lgsobalvarro]

All right.
iCab have a nice feature called "Error protocol (Smiley)"

It records all HTML errors of Web pages. A smiley-face will indicate if the HTML code is OK (has no HTML errors, or hazards). Errors make the smiling face sad. By clicking the red smileys iCab open a window where all the errors are identified with a small description.

So nice for all web developers.