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HTML

              
                
<p style="text-align: center;"><a class="button" href="#PopupDownload" id="get-download">Download</a></p>
<div data-ml-modal="" id="PopupDownload">
	<div class="modal-overlay"></div>
	<div class="modal-dialog">
		<div class="modal-content center">
          <div class="adpop-top">
			<h2 style="margin: 0px; text-align: center;">Download window name</h2>
            <div class="ad-pop__close" onclick="document.getElementById(&quot;PopupDownload&quot;).style.display=&quot;none&quot;"><svg style="height: 25px; width: 25px;" viewbox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="M278.6 256l68.2-68.2c6.2-6.2 6.2-16.4 0-22.6-6.2-6.2-16.4-6.2-22.6 0L256 233.4l-68.2-68.2c-6.2-6.2-16.4-6.2-22.6 0-3.1 3.1-4.7 7.2-4.7 11.3 0 4.1 1.6 8.2 4.7 11.3l68.2 68.2-68.2 68.2c-3.1 3.1-4.7 7.2-4.7 11.3 0 4.1 1.6 8.2 4.7 11.3 6.2 6.2 16.4 6.2 22.6 0l68.2-68.2 68.2 68.2c6.2 6.2 16.4 6.2 22.6 0 6.2-6.2 6.2-16.4 0-22.6L278.6 256z"></path></svg></div>
          </div>
          <br />
          <div style="width: 660px;">This text is an example of the extension preview. You can change this text to any text you want <a href=""><img border="0" height="100%" oma="" src ="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPpjl05fg20rcGES5NySDl8jQSnSbTvjO7Es_dAK6Hl0mNKRtRL0rdMZV_M5D9BwciKN0Rq_rTIOUH-qIibUZ5he0EQBDpalyqPTltW31682VAj4Ayj0FtOaC3s0SFOFFhXmxMD22CYmvkN8dh5AIJuMZcNXIMw_jgYIk3QlcvqqCaqx-mTPSmb3xt/s16000/Add.png" tech="" width="100%" /></a>This text is an example of the extension preview you can change This text into any text you want</div><div style="text-align: center; width: 660px;"> 
          <a class="button" href="https://blog1prince.blogspot.com/" id="button-download">Download file</a></div>
	</div>
</div></div>
              
            
!

CSS

              
                #button-download{display:inline-flex;display:-webkit-inline-flex;flex-wrap:wrap;-webkit-flex-wrap:wrap;align-items:center;-webkit-align-items:center;margin-bottom:10px;padding:9px 20px;border-radius:10px;font-size:.8rem;line-height:1.3rem;background-color:#fdd929;color:#ff2121}
.adpop-top{height:40px;width:100%;border-bottom:1px #E5E5E5 solid}
.btn-at{display:block;height:50px;color:#fff!important;font-size:18px;text-transform:uppercase;background:#f3a;text-align:center;line-height:50px;width:200px;margin:12px auto;transition:all 0.4s ease-in}
[data-ml-modal]{position:fixed;top:0;bottom:0;left:0;right:0;overflow-x:hidden;overflow-y:auto;-webkit-overflow-scrolling:touch;z-index:999;width:0;height:0;opacity:0}
[data-ml-modal]:target{width:auto;height:auto;opacity:1;-webkit-transition:opacity 1s ease;transition:opacity 1s ease}
[data-ml-modal]:target .modal-overlay{position:fixed;top:0;bottom:0;left:0;right:0;cursor:pointer;background-color:#000;background-color:rgba(0,0,0,0.7);z-index:1}
[data-ml-modal] .modal-dialog{border-radius:6px;box-shadow:0 11px 15px -7px rgba(0,0,0,0.2),0 24px 38px 3px rgba(0,0,0,0.14),0 9px 46px 8px rgba(0,0,0,0.12);position:relative;width:90%;max-width:660px;max-height:70%;margin:10% auto;overflow-x:hidden;overflow-y:auto;z-index:2}
[data-ml-modal] .modal-content{background:#fff;padding:23px 27px}
@media (max-width:767px){[data-ml-modal] .modal-dialog{margin:20% auto}}
.ad-pop__close{position:absolute;right:1em;top:1em;width:1.1em;height:1.1em;cursor:pointer}
              
            
!

JS

              
                var downloadButton = document.getElementById("button-download"); var counter = 20; var newElement = document.createElement("span"); newElement.innerHTML = "Please wait 20 seconds"; var id; downloadButton.parentNode.replaceChild(newElement, downloadButton); function startDownload() { this.style.display = 'none'; id = setInterval(function () { counter--; if (counter < 0) { newElement.parentNode.replaceChild(downloadButton, newElement); clearInterval(id); } else { newElement.innerHTML = "please wait" + " " + counter.toString() + " " + "second .... "; } }, 1000); }; var clickbtn = document.getElementById("get-download"); clickbtn.onclick = startDownload;
              
            
!
999px

Console