DAWN Ontario: DisAbled Women's Network Ontario

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Guidelines for Building Accessible Web Sites
by Barbara Anello

en français

 

Frames:
HTML frames used to sub-divide a browser screen into smaller and separate sub units can be inaccessible to women using screen readers and users with non-frame browsers.

Forms - Input Boxes:
Some browsers cannot access Web page form tags without the use of a mouse. Women who are blind may not have access to the input form tags. Also, persons with mobility impairments may find it difficult to access the small radio buttons and check boxes in HTML form tags.

Graphic Format Tables and Charts:
Information presented in graphic format only - e.g. pie chart or text inside a bitmap image, is not accessible.

Concrete graphic links:
Some women with cognitive, learning, or developmental disabilities may have problems interpreting text-only pages. Graphic images or image maps used as links can be very helpful. Moving images can be distracting to people with attention deficit disorder.

Text Format Tables:
Tables presented with X & Y text columns are difficult for screen readers to access.

Text Columns:
Multiple text columns across the screen are very difficult for screen reading devices to interpret.

Avoid Browser Specific HTML Tags:
Some browsers have their own specific HTML tags that cannot be interpreted by other browsers.

Multiple formats for downloadable documents:
Sites offering document downloads will sometimes only offer formats often inaccessible for persons with visual disabilities – e.g. PDF files (require Acrobat Reader) (__ size ; __ pages)

Lists and List Tags:
Certain HTML tags will not show the preceding numbers on their lists when read with screen readers.

Photographs:
Women with visual disabilities cannot access the photographs on Web pages. Consider using alternative text to describe what's in the picture as best as possible.

Navigation Buttons:
Some Web sites utilize graphic buttons for navigation. Women with cognitive, learning, or developmental disabilities can use graphic buttons to navigate more easily. Please consider using alternative text to mark these buttons so they are accessible for women with visual disabilities using screen readers. It is helpful to include text-based navigation links.

Graphic Links:
Some browsers cannot use images as links, or read the alternate text within the image tag. Also true for those suffering from Disgraphia or other forms of Dysphasia - the inability to decode pictures and images (they invert the foreground and background). When someone with this condition reads the batman symbol they see yellow fangs and not a black bat.

Backgrounds:
Most browsers cannot read the so-called Web page background pictures or "wallpaper" and these backgrounds quite often interfere with the text due to poor contrast.

Larger Graphic Links:
Persons with mobility impairments may find it more difficult to move the mouse with great precision. Slightly larger graphic links, e.g. a minimum of 0.5 inch by 0.5 inch, will make navigation much easier to achieve.

Lists of Text-Based Links:
Some sites like to place long lists of text-based links close together in rows or columns. This increases the probability of mouse errors for persons with mobility impairments.

Allow for re-sizeable fonts:
Some users have partial vision and may need to change the default font size to a larger type.

Use of Bullets:
Bullets, as a graphic without a text tag (alternative text - ALT tag), cannot be detected by many screen reading devices.

Easy to use downloads:
Some files or programs made available for downloads arrive in more difficult to use compressed formats; e.g. zipped files. Some of these require the user to read complex read-me files to use the program. Everyone appreciates easy to use downloads.

Video Clips and Real-Time Audio Sound Stream:
Some sites offer video clips in various formats. At present this is a minority of sites but these are likely to increase over the next few years. Without enhancements the video portion is inaccessible to women with visual disabilities, and the audio portion inaccessible to persons who are deaf or hard of hearing.

Text Description for Audio Clips:
Some sites enhance their pages with audio clips, but fail to provide text versions for persons who are deaf or hard of hearing. The information contained in the audio clip is then inaccessible.

Punctuation:
Punctuation helps structure documents for a screen-reading device.

Blinking Text:
Blinking Text can easily get missed by some screen reading devices.

PDF files:
PDF files, if created originally from word processing files, are generally readable, provided the creator did not set a high security level. The security feature in Adobe Write, to mitigate tampering, is the prerogative of the author, and if the level is set high, the file cannot be opened by the accessible version of Adobe reader, 5.1, used in conjunction with recent releases of JAWS and WindowEyes. If files are scanned in, the text is virtually a picture of text and not real characters, hence unreadable by screen readers. In this case, it is necessary to save the file and use a thing called a virtual printer, which creates an image file which can be subjected to OCR. Recent versions of Open Book, Kerzweil 1,000, and OmniPage have this feature. The results, as in any OCR situation, can be precarious varying from very good to useless. In many cases columnar or chart materials can be so badly reformatted as to make intelligibility impossible.

 

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