10 DIV CSS issues that need attention_html/css_WEB-ITnose

1. Check whether the HTML elements have spelling errors or forget 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.

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 a certain div is deleted After the block, the display returns to normal, and you can determine where the error occurred.

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

Using the float attribute for layout will 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 surrounding The layout of float elements will be confusing. This is a famous bug of MacIE. If you don't

know about it, you will take detours.

6. Float elements must specify the width attribute

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

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 a float element to set margin and padding). You can also use hacks to specify extraordinary 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 Older browsers will not display properly. Therefore, please ensure that the sum of the widths is less than 99%.

9. Have you reset the default style?

Some attributes such as margin, padding, etc., will be interpreted differently by different browsers. 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? " -//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd/"＞