One, less use of biased doors.
Similar to Break-word line breaks, Z-index manual layering, as well as vertical alignment, and so on these biased CSS is best less useful, because not all browsers are supported, and extremely difficult to pass the web detection.
Second, the center is not the value of float.
Many novices mistakenly think of center as a value of float, but that's not the case. Center is just a text-align value.
Third, the alignment cannot include two values.
Many beginners will fill in the float or text-align two values, such as: Float:left top. This is not allowed and the browser is not recognized.
Four, scroll bar color is best not to customize.
Many browsers do not normally recognize the scroll bars of custom colors, and many custom colors do not pass through the web.
Five, separate scroll bar settings.
Now often use overflow-x (horizontal scroll bar) or overflow-y (vertical scroll bar), in setting this time will often find that not all the client has the effect, you can set the best in the body and HTML at the same time set. However, this CSS is not supported by CSS2.1 (CSS2.1 supports overflow, while defining a horizontal scrollbar) until CSS3 supports this definition. Use as little as possible.
Six, background and color are the same colors will be warned.