Adobe Flash use an extension to embed called flashvars. IT in not in the official W3C liste.
HTML Validator does note like it.
Error in line 45 at character 478: The "flashvars" attribute is not valid for the "embed" element. Some valid attributes for this element are: "accesskey", "align", "allowfullscreen", "allowscriptaccess", "alt", "autoplay", "autostart", "base", "bgcolor", "border", "class", "contenteditable", "contextmenu", "controls", "dir", "draggable", "dropzone", "frameborder", "height", "hidden", "hidefocus", "hspace", "id", "lang", "logo", "loop", "menu", "name", "palette", "play", "pluginspage", "progress", "quality", "role", "scale", "song", "spellcheck", "src", "style", "swliveconnect", "swremote", "swstretchhalign", "swstretchstyle", "swstretchvalign", "tabindex", "title", "type", "units", "unselectable", "volume", "vspace", "width", "wmode", "xml:space", "on" attributes (like event handlers), "aria-*" attributes, and "item*" attributes.
It is quite commonly used.
However, I cannot suppress the error message in any way.



