把一个& nbsp;在一个空的< td>里面？ [英] Is it good to put a   inside an empty <td>?

问题描述

如果这是结构：

 < table cellspacing =0cellpadding =0> 
< tr> 
< td>我在这里不需要任何东西，我应该总是把& nbsp;这里< / TD> 
< td>项目< / td> 
< / tr> 
< tr> 
< td>模型< / td> 
< td> one< / td> 
< / tr> 
< tr> 
< td>模型< / td> 
< td> two< / td> 
< / tr> 
< tr> 
< td>模型< / td> 
< td>三< / td> 
< / tr> 
< / table> 
  

屏幕阅读器如何读取空白 td ？它在语义上是正确的吗？

解决方案

语义上正确的恕我直言将是保持一个空单元真的为空。但是，为了实际的原因，我也使用& nbsp; s来填充空单元格。

至于屏幕读者，我必须做出一个有根据的猜测：空的节点可能不会被读取，因为HTML主要由空白文本节点组成，读者可以忽略，我假设& nbsp; 折叠到阅读器应用程序中的一个简单空间（因为不间断是可视媒体的属性）。

对于可视化渲染，可以依赖CSS表属性 empty-cells ：

 表格{
 empty-cells：show; 
} 
  

If this is the structure:

<table cellspacing="0" cellpadding="0">
   <tr>
      <td>I don't need anything here, should I always put a &nbsp; here?</td>
      <td>item </td>
   </tr>
   <tr>
      <td>model</td>
      <td>one</td>
   </tr>
   <tr>
      <td>model</td>
      <td>two</td>
   </tr>
   <tr>
      <td>model</td>
      <td>three</td>
   </tr>
</table>

How will a screen reader read a blank td? Is it semantically correct?

解决方案

Semantically correct IMHO would be to keep an empty cell really empty. However, I, too, fill empty cells with  s for pragmatic reasons.

As for screen readers, I'll have to make an educated guess: Empty nodes will likely not be read, because HTML consists mostly of whitespace text nodes, which readers ignore, and I assume, that   is collapsed to a simple space in reader applications (since non-breaking is a property of visual media).

For rendering visually, one could rely on the CSS table property empty-cells:

table {
    empty-cells: show;
}

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