by Mrs Robin Williams 

Backgrounds

Default gray color

Color combinations of text and background that make the text hard to read

Busy, distracting backgrounds that make the text hard to read

Text

Text that is too small to read

Text crowding against the left edge

Text that stretches all the way across the page

Centered type over flush left body copy

Paragraphs of type in all caps

Paragraphs of type in bold

Paragraphs of type in italic

Paragraphs of type in all caps, bold, and italic all at once

Underlined text that is not a link

Links

Default blue links

Blue link borders around graphics

Links that are not clear about where they will take you

Links in body copy that distract readers and lead them off to remote, useless pages

Text links that are not underlined so you don't know they are links ..(If you're not going to underline your links, please make darned sure ..that each link is perfectly clearly a link! Don't make me wander around ..with my mouse checking to see if randomly colored text is a link!)

Dead links (links that don't work anymore)

Graphics

Large graphic files that take forever to load

Meaningless or useless graphics

Thumbnail images that are nearly as large as the full-sized images they link to

Graphics with no alt labels

Missing graphics, especially missing graphics with no alt labels

Graphics that don't fit on the screen (assuming a screen of 800 x 600 pixels)

Tables

Borders turned on in tables

Tables used as design elements, especially with extra large (dorky) borders

Blinking and animations

Anything that blinks, especially text

Multiple things that blink

Rainbow rules (lines)

Rainbow rules that blink or animate

"Under construction" signs, especially of little men working

Animated "under construction" signs

Animated pictures for email

Animations that never stop

Multiple animations that never stop

Junk

Counters on pages -- who cares

Junky advertising

Having to scroll sideways (800 x 600 pixels)

Too many little pictures of meaningless awards on the first page

Frame scroll bars in the middle of a page

Multiple frame scroll bars in the middle of a page

Navigation

Unclear navigation; over complex navigation

Complicated frames, too many frames, unnecessary scroll bars in frames

Orphan pages (no links back to where they came from, no identification)

Useless page titles that don't explain what the page is about

General Design

Entry page or home page that does not fit within standard browser window (800 x 600 pixels)

Frames that make you scroll sideways

No focal point on the page

Too many focal points on the page

Navigation buttons as the only visual interest, especially when they're large (and dorky)

Cluttered, not enough alignment of elements

Lack of contrast (in color, text, to create hierarchy of information, etc.)

Pages that look okay in one browser but not in another from