span width setting

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Release： 2018-06-12 11:43:30

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How to set the width of span in html? This seems to be a very simple problem. It seems that you can just use the width attribute in style.

The width setting of span is invalid by default
How to set the width of span in html? This seems to be a very simple problem. It seems that you can just use the width attribute in style. For example,

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
<title>Test Span</title> 
<style type="text/css"> 
span { 
background-color:#ffcc00; 
width:150px; 
} 
</style> 
</head> 
<body> 
fixed <span>width</span> span 
</body> 
</html>

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After testing, it was found that it was invalid, whether in Firefox or IE.

By consulting the definition of width in the CSS2 standard, we found that the original width attribute in CSS is not always valid. If the object is an inline object, the width attribute will be ignored. Firefox and IE originally did this in compliance with standards.
Modifying span to block type and setting float is not a perfect solution
Add the display attribute in span's CSS and set span to block type Element. This way the width is indeed effective, but it also changes The preceding and following text are separated into different lines. In this way, span actually becomes p completely.

span { background-color:#ffcc00; display:block; width:150px; }

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Many people will suggest adding another CSS attribute float, which can indeed solve the problem under certain conditions. For example, in our example, if there is no text in front of span, it is indeed feasible. But if there is, the text before and after will be connected together, and span will run to the second line.

span { 
background-color:#ffcc00; 
display:block; 
float:left; 
width:150px; 
}

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Button situation
In fact, among the various Elements in Html, there are indeed situations where it is both inline and the width can be set. For example, the following code displays the button object, which can appear in the middle of the text and set the width.

<body> 
fixed <button style="width:150px;">width</button> button 
</body>

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Can span be displayed like a button? Through the definition of display and the explanation of the inline object in the CSS2 standard, we found that the makers of the CSS2 standard have made either-or regulations on whether all Elements belong to inline, either inline or block, and there is no such thing as button. Inline, you can set the width attribute value like block.

Updated standard CSS 2.1

Looking at the updated standard, an attribute value called inline-block has been added to the definition of display in the CSS2.1 standard draft, which is exactly for us faced with this situation. Then take a look at the corresponding situations of various browsers.

Firefox

I learned from the display documentation that inline-block will be implemented in Firefox 3 in the future. Through the Mozllia extended attribute reference, we learned that in versions before Firefox 3, such as the current Firefox 2, you can use -moz-inline-box to achieve the same effect.

IE

I learned from the display documentation in MSDN that inline-block has been implemented. The actual test found that there is no problem after IE 6.0.

Perfect solution

The CSS definition of the following code perfectly solves the span width setting problem. Since browsers usually ignore unsupported CSS properties, it is best to write the display:inline -block line at the end, so that in Firefox, if the future Firefox 3 is reached, this line will work. The code Can be compatible with various versions at the same time.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
<title>Test Span</title> 
<style type="text/css"> 
span { 
background-color:#ffcc00; 
display:-moz-inline-box; 
display:inline-block; 
width:150px; 
} 
</style> 
</head> 
<body> 
fixed <span>width</span> span 
</body> 
</html>

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