In no particular order.
1) Excessive font control. Just because you like sans-serif fonts doesn't mean that everyone does. Believe it or not, serifs aren't just decorative. They make it easier to scan long lines of text. This applies to size as well. If you want to use size for emphasis or de-emphasis use " * xx-small | x-small | small | medium | large | x-large | xx-large" and use them sparingly.
2) Only looking at your pages in one or two browsers. Your page should be useful in all browsers, including the ones in phones and lynx.
3) Using proprietary formats. Not everyone can play windows media or flash animations.
4) Weird colors. You don't want your users going blind reading green on purple.
5) Using raster images instead of SVGs for charts and graphs.
1) Excessive font control. Just because you like sans-serif fonts doesn't mean that everyone does. Believe it or not, serifs aren't just decorative. They make it easier to scan long lines of text. This applies to size as well. If you want to use size for emphasis or de-emphasis use " * xx-small | x-small | small | medium | large | x-large | xx-large" and use them sparingly.
2) Only looking at your pages in one or two browsers. Your page should be useful in all browsers, including the ones in phones and lynx.
3) Using proprietary formats. Not everyone can play windows media or flash animations.
4) Weird colors. You don't want your users going blind reading green on purple.
5) Using raster images instead of SVGs for charts and graphs.
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