mod_accessibility addresses the the difficulty by offering assorted \”views\” onto scheme content. It crapper transform scheme table for availableness in the behavior pioneered by the BBC \”Betsie\” program, but more importantly in generates essentially _different_ views, including metadata same to the table-of-contents, index and references in tralatitious publishing, every acquirable at-a-keyclick to the user. But unlike tralatitious publishing, mod_accessibility does not require proactive cooperation from authors. And unlike whatever accessibility-enhanced browsers, mod_accessibility places no financial or technological charge on the unfit user. Only the scheme computer or agent chief requirement be afraid with it.

HTML (including XHTML, which for the purposes of this article is the same thing) is essentially an reachable medium. Coupled to that, it supports guidance (hyperlinks), transmission noesis (<img>, <object>, etc), interactive systems and controls (forms and script) and presentational detail. The fundamental generalisation of HTML availableness is graceful fallback: narrative book is accessible, and in situations where other noesis is problematic (eg for a arrange of unfit users – most obviously the blind), non-textual noesis crapper be presented as simple book without substantial loss to contents, functionality or navigation.

However, there are whatever common problems regarding Web accessibility:

* Missing contents. In whatever of the worst cases, there is nothing meaning in HTML; only Flash content, a Word document, or a program of images. At worst this is inaccessible at some price, and at prizewinning it relies on the individual having expensive doc equipment available.
* This is distributed and happens for a number of reasons, including defective authoring and publishing software, ignorance amongst developers, and problems of act between developers and their managers or clients.
* A typical warning arises where navigational devices (like a toolbar) are embedded in tender contents. Further examples crapper be institute in layout tables and clientside scripts.
* A Byzantine writing haw never be reachable to a person without the germane educational background, but crapper nevertheless be improved by presenting a beatific overview and navigation.
* Limitations in the abilities of scheme browsers to inform the information acquirable in webpages effectively to users.

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