Yes, people still use iframes (and with a transitional doctype they are perfectly valid).
The garbage above your doctype means that neither the w3c validation service, nor any browser, even sees the doctype on your page; consequently, the file runs in "less than standards mode" in some browsers and in "quirksmode" in other browsers -- all in all this is not good. And even if corrected the source is hardly suitable for the Web in its present state.
Nevertheless, the correction for the question you asked on the page you asked about may be to add this to the CSS file:
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table { font-size: 12px; }
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