Summary of common DIV CSS errors_html/css_WEB-ITnose

CSS+DIV is one of the commonly used terms in website standards (or "WEB standards"). It is usually used to explain the difference from the table positioning method in HTML web design language, because in XHTML website design standards, it is no longer Use table positioning technology, but use css div to achieve various positioning. It's easy to make some mistakes when using DIV CSS coding. This article lists some common mistakes:

1. Check whether the HTML element has spelling errors or forgets the closing tag

Even veterans often make mistakes in the nesting relationship of divs. You can use Dreamweaver's verification function to check for errors. Webjx.Com

　2. Check whether the CSS is correct

　Check whether there are spelling errors, whether you forgot the ending }, etc. You can use CleanCSS to check CSS for spelling errors. CleanCSS is a tool to reduce weight for CSS, but it can also check for spelling errors.

　3. Determine where the error occurred

If the error affects the overall layout, you can delete the div blocks one by one until the display returns to normal after deleting a certain div block, then you can determine where the error occurred. Location.

　4. Use the border attribute to determine the layout characteristics of the error element


Using the float attribute for layout may cause errors if you are not careful. At this time, add the border attribute to the element to determine the element boundary, and the cause of the error will be revealed.

5. The parent element of a float element cannot specify the clear attribute

If you use the clear attribute on the parent element of a float element under MacIE, the layout of the surrounding float elements will be confused. This is a famous bug of MacIE. If you don't know it, you will take detours.

　6. Float elements must specify the width attribute Webjx.Com

　Many browsers have bugs when displaying float elements without specified width. So regardless of the content of the float element, the width attribute must be specified for it.

In addition, try to use em instead of px as the unit when specifying elements.

7. Float elements cannot specify attributes such as margin and padding.

IE has a bug when displaying float elements with margin and padding specified. Therefore, do not specify margin and padding attributes on float elements (you can nest a div inside the float element to set margin and padding). You can also use hacks to specify special values ​​for IE.

8. The sum of the widths of float elements must be less than 100%

If the sum of the widths of float elements is exactly 100%, some ancient browsers will not display properly. Therefore, please ensure that the sum of the widths is less than 99%. Web Teaching Network

　9. Have you reset the default style? Web Teaching Network

Different browsers will have different interpretations of certain attributes such as margin, padding, etc. Therefore, it is best to set all margin and padding to 0, list style to none, etc. before development.

10. Did you forget to write the DTD?

If the display results of different browsers are still different no matter how you adjust it, then you can check whether you forgot to write the following line of DTD at the beginning of the page:
　 〈!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"〉