How to achieve horizontal middle alignment? _html/css_WEB-ITnose

我经常看到有人说margin-left和margin-right设置为auto就能水平方向中间对齐。
或者设置center里面的内容就能对齐。
能给我解释解释margin-left和margin-right设置为auto,align设置为center和center标签的水平方向对齐有什么不一样吗？
为什么我下面这个例子我用了这么多对齐方式它就是不水平方向中间对齐呢？

    
    
    
    
    
    
    
    
    
    
    
    
    
    

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Reply to discussion (solution)

Generally, block-level elements use margin: 0 auto; for centered
elements, text-align is used: center; center

You need to use margin: 0 auto and padding: 0 auto at the same time
What browser are you using? Switch to IE and Firefox and compare, there should be one that is horizontally centered

You need to use margin: 0 auto and padding: 0 auto at the same time
What browser are you using? Switch to IE and Firefox and compare it. There should be a horizontally centered
but it still doesn’t work.

Use text-align=center

Quoting the reply from lixinstudio on the 2nd floor:

To use margin: 0 auto and padding: 0 auto at the same time
What browser are you using? Switch to IE and Firefox and compare it. There should be one that is horizontally centered

but it still doesn’t work.
Use margin: 0 auto and padding: 0 auto for the div and still can’t align it. I’m using IE 8 and Firefox 9.

I often see people say that setting margin-left and margin-right to auto can align the middle horizontally.
Or set the content in center to align it.
Can you explain to me the difference between setting margin-left and margin-right to auto, setting align to center, and the horizontal alignment of center tags?
Why do I use so many alignment methods in the following example but it is not aligned horizontally in the middle?

I know how to align it, but I don’t know why setting the div’s margin: 0 auto and padding: 0 auto can’t align the entire table in the middle.
Just trying to figure it out.

The table is aligned in the middle. There is no need to add a div outside. As long as

it is aligned relative to the middle of the container. I haven't tried anything else. There is a way to align them anyway.
Other alignments vary between browsers and must be tested separately.

margin:0 auto; can be centered. Of course, the width of your current layer must be smaller than the previous layer to see the effect.

Sometimes, width, margin:0 auto; must be defined for it to take effect

Take a look at the csdn forum, the source code of this page.
body of
#bbscsdn_wrap {
background: white;
width: 960px;
margin: 0 auto;
}

because you used absolute

does not set width; margin has no effect

Because you used position:absolute, you can only use left to achieve horizontal centering.

Because you used position:absolute, you can only use left to achieve horizontal centering.
What does left mean?

Because you used position:absolute, you can only use left to achieve horizontal centering.
Do you mean the left of position?

Quoting the reply from yueshangchuanqi on the 13th floor:

Because you used position:absolute, you can only use left to achieve horizontal centering.

Do you mean the left of position?

Well, I explained it in my reply above.

Quoted from the 16th floor rosecshly0928's reply:
Quoted from the 13th floor yueshangchuanqi's reply:

Because you used position:absolute, you can only use left to achieve horizontal centering.

Do you mean the left of position?


Well, I explained it in my reply above.
Thank you, I tried it, because using absolute, removing this or setting left can align it.

Quote from 17th floor yueshangchuanqi’s reply:

Quote from 16th floor rosecshly0928’s reply:
Quote from 13th floor yueshangchuanqi’s reply:

Because you used position:absolute So You can only use left to achieve horizontal centering.

Do you mean the left of position?


Well, I explained it in my reply above.

Thank you, I tried it, just because I used absolu...

Haha, that’s it. It’s solved.