How to delete the border of links in IE? [repeat] - how to remove borders around links in IE? [duplicate]

problem ：

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• How switch off image border in IE4 answers How to be in IE4 in Close the image border

I have a navigation bar which consists of a <img> elements within their respective <a> elements. I have a navigation bar , It consists of their own <a> In the element <img> Element composition .However, for some reason in IE its making a dark black border around the images. However , For some reason , stay IE It forms a dark black border around the image .Its not doing the same in other browsers, I can't seem to figure this out... This is the html that I'm using. It doesn't do the same thing in other browsers , I can't seem to understand ...... This is what I'm using HTML.

<li>   <a href="#">      <span id="nav1">         <img src="tt_1.png" />      </span>   </a></li>

I have about 5 links all written like that and I've used CSS to style it into a nav bar. I have about 5 All links are written like this , I use CSS Design it as a navigation bar .On other browsers it comes out like this On other browsers , It's like this

but on IE it comes out like this But in IE On , It's like this

I've never encountered a problem like this before and what I've reserached to try and fix it so far haven't worked. I have never encountered such a problem before , So far, my attempt to fix it has not been successful .Is there a way to take out these borders using CSS? Is there any way to use CSS Take out these borders ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/XBo1