在较旧的Internet Explorer中,拖放元素被粘在光标上

若要重现此错误,请在Internet Explorer 6中打开以下web应用程序(我相信在某些较新版本的Internet Explorer中也会出现相同的错误,因为在以兼容模式运行时,Internet Explorer 11中也会出现此错误,该模式应模拟Internet Explorer 8):
http://flatassembler.000webhostapp.com/compiler.html
现在,在右上角,你应该看到三个按钮。
点击左边的第一个,最小化按钮。

你知道发生了什么事吗?有什么快速的解决办法吗?下面是我用来实现拖放功能的代码:

<!-- ... -->
<div id="ikona"
            style="text-align:center; display:none; position:absolute; color:white; font-family:Arial; font-size:10px;">
            <img src="https://www.theflatearthsociety.org/forum/avr/avatar_1461509_1483220545.png" alt="AEC" style="width:75px;" draggable="false"/><br/>
            <span id="opis">Arithmetic<br/>Expression<br/>Compiler</span>
        </div>
        <script type="text/javascript">
    //...
document.getElementById("smanji").onclick=function() { //The "minimize" button.
                    //...
        document.getElementById("ikona").style.display="block";
                    document.getElementById("opis").style.backgroundColor="transparent";
                    document.getElementsByTagName("nav")[0].style.display="none";
                    document.getElementById("ikona").style.left=document.body.clientWidth/2-document.getElementById("ikona").offsetWidth/2;
                    document.getElementById("ikona").style.top="auto";
                    document.getElementById("ikona").style.bottom="8px";
                }
        //...
        if (!(/(M|m)obile/.test(navigator.userAgent))) {
        //...
        document.getElementById("ikona").onclick=function()
                    {
                        document.getElementById("opis").style.backgroundColor="blue";
                    }
                    document.getElementById("ikona").onmousedown=function()
                    {
                        dragInit(this);
                    }
        //...
    }
    //...
        var isFirefox=false;
        var selected;
        var x_pos = 0;
        var y_pos = 0;
        var x_elem = 0;
        var y_elem = 0;
        function dragInit(elem) {
            selected = elem;
            x_elem = x_pos - selected.offsetLeft;
            y_elem = y_pos - selected.offsetTop;
        }
        function moveElement(e) {
            if (!window.event) {
                isFirefox=true;
                window.event=new Object();
            }
            if (isFirefox)
            {
                window.event.clientX=e.clientX;
                window.event.clientY=e.clientY;
            }
            x_pos = window.event.clientX;
            y_pos = window.event.clientY;
            if (selected) {
                selected.style.left = (x_pos - x_elem) + 'px';
                selected.style.top = (y_pos - y_elem) + 'px';
            }
        }
        function destroy(e) {
            if (!window.event) {
                isFirefox=true;
                window.event=new Object();
            }
            if (isFirefox)
            {
                window.event.clientX=e.clientX;
                window.event.clientY=e.clientY;
            }
            if (window.event.clientX<document.getElementById("ikona").style.left.substring(0,document.getElementById("ikona").style.left.length-2)*1
                || window.event.clientX>document.getElementById("ikona").style.left.substring(0,document.getElementById("ikona").style.left.length-2)*1+document.getElementById("ikona").offsetWidth
                || window.event.clientY<document.getElementById("ikona").style.top.substring(0,document.getElementById("ikona").style.top.length-2)*1
                || window.event.clientY>document.getElementById("ikona").style.top.substring(0,document.getElementById("ikona").style.top.length-2)*1+document.getElementById("ikona").offsetHeight)
                    document.getElementById("opis").style.backgroundColor="transparent";                selected = null;
        }
        document.onmousemove = moveElement;
        document.onmouseup = destroy;`
//...
    </script>
<!-- ... -->

对于一些仍在使用旧版本Internet Explorer的网站访问者。。。