This website has been developed using the latest XHTML and CSS technologies. It is structured with valid 1.0 Strict XHTML and semantic
markup. Cascading style sheets are used for visual layout. Both are validated as by the W3C Markup Validation Services.
You can validate this page's XHTML and
the website's CSS.
The AH Allen website is accessible on a range of browsers including Internet Explorer, Firefox, Opera, Safari and others
on both PC and Mac platforms.
All pages are WCAG AA approved, complying wih all priority 1 and 2 guidelines of the
W3C Web Content Accessibility
Guidelines. This is a judgement call; many guidelines are intentionally vague and can not be tested automatically.
This site uses only relative font sizes, compatible with the user-specified "text size" option in visual browsers. If your browser or browsing
device does not support stylesheets at all, the content of each page is still readable.