在html< img width = xxx>中指定的图像宽度单位是什么？ [英] what unit of image width specified in html <img width=xxx>?

问题描述

我对html语言完全陌生。在html中附加的图片中，我们需要通过以下标记指定图片的宽度：

 < img width = 350 src ='/ var / tmp.jpg'/> 
  

那么宽度单位是多少？我猜这是在像素？如果这是像素，这是否意味着图像的大小实际上是相对于显示器的分辨率？我打开一个网页，在不同的机器上显示宽度为350的图像，并显示不同的分辨率。我测量屏幕上显示的图像的宽度，它们是相同的。那么，有什么办法可以找出图像的绝对宽度，以厘米或毫米（在PHP中）？ 。答案必须是30个字符。所以我输入更多。

I am totally fresh to html language. In the image attached in the html, something we need to specify the width of the image by the following tag

<img width=350 src='/var/tmp.jpg'/>

So what is unit of the width here? I guess it is in pixel? If that's in pixel, does it mean that the size of the image actually relative to the resolution of the display? I open a webpage with a image shown in the width of 350 in different machine with different display of different resolution. I measure of the width of the image shown on the screen, they are the same. So is that any way to I figure out the absolute width of the image in cm or mm (in php)?

解决方案

pixels. the answer must be 30 chars long. so I'm typing more.

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