extended_valid_elements : 
        "a[class|style|href|rel|rev|target|title|type]," +
        "b[],"+
        "blink[],"+
        "blockquote[class|align|cite|clear|height|type|width],"+
        "br[clear],"+
        "caption[class|align|height|valign|width],"+
        "center[class|align|height|width],"+
        "col[class|align|bgcolor|char|charoff|span|valign|width],"+
        "colgroup[style|align|bgcolor|char|charoff|span|valign|width],"+
        "comment[],"+
        "em[],"+
        "font[class|style|color|face|font-weight|point-size|size],"+
        "h1[class|style|align|clear|height|width],"+
        "h2[class|style|align|clear|height|width],"+
        "h3[class|style|align|clear|height|width],"+
        "h4[class|style|align|clear|height|width],"+
        "h5[class|style|align|clear|height|width],"+
        "h6[class|style|align|clear|height|width],"+
        "hr[class|style|align|clear|color|noshade|size|width],"+
        "img[class|style|align|alt|border|height|hspace|src|vspace|width],"+
        "li[class|align|style|clear|height|type|value|width],"+
        "marquee[class|style|behavior|bgcolor|direction|height|hspace|loop|scrollamount|scrolldelay|vspace|width],"+
        "ol[class|align|clear|height|start|type|width],"+
        "p[align|clear|height|width],"+
        "pre[clear|width|wrap],"+
        "s[],"+
        "small[],"+
        "span[align],"+
        "strike[],"+
        "strong[],"+
        "sub[],"+
        "sup[],"+
        "table[class|style|align|background|bgcolor|border|bordercolor|bordercolordark|bordercolorlight|"+
               "bottompadding|cellpadding|cellspacing|clear|cols|height|hspace|leftpadding|"+
               "rightpadding|rules|summary|toppadding|vspace|width],"+
        "tbody[class|style|align|bgcolor|char|charoff|valign],"+
        "td[class|style|abbr|align|axis|background|bgcolor|bordercolor|"+
           "bordercolordark|bordercolorlight|char|charoff|headers|"+
           "height|nowrap|rowspan|scope|valign|width],"+
        "tfoot[class|style|align|bgcolor|char|charoff|valign],"+
        "th[class|style|abbr|align|axis|background|bgcolor|bordercolor|"+
           "bordercolordark|bordercolorlight|char|charoff|headers|"+
           "height|nowrap|rowspan|scope|valign|width],"+
        "theadclass|[style|align|bgcolor|char|charoff|valign],"+
        "tr[style|align|background|bgcolor|bordercolor|"+
           "bordercolordark|bordercolorlight|char|charoff|"+
           "height|nowrap|valign],"+
        "tt[style],"+
        "u[style],"+
        "ul[align|clear|height|start|type|width]",
    