Cómo crear un HTML Parser Tools en Blogger

<style scoped="" type="text/css">
#parser2{position:relative;overflow:hidden}
#parser2 .btn,#parser2 .btn:active{background-image:none}
#parser2 .btn{font-weight:400;padding:6px 12px;margin-bottom:5px;font-size:14px;line-height:1.42857143;text-align:center;white-space:nowrap;-ms-touch-action:manipulation;touch-action:manipulation;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;border:0;border-radius:4px;cursor:pointer;transition:all .3s}
#parser2 .btn:active:focus,#parser2.btn:focus{outline:0}
#parser2 .btn:focus,#parser2 .btn:hover{color:#333;text-decoration:none;outline:0}
#parser2 .btn:active{outline:0;-webkit-box-shadow:inset 0 3px 5px rgba(0,0,0,.125);box-shadow:inset 0 3px 5px rgba(0,0,0,.125)}
#parser2 .btn-primary{color:#fff;background:#3e51b5}
#parser2 .btn-primary:focus,.button-group button:disabled{color:#fff;background:#286090}
#parser2 .btn-primary:active,#parser2 .btn-primary:hover{color:#fff;opacity:.9}
#parser2 .btn-danger{color:#fff;background:#f39c12}
#parser2 .btn-danger:focus{color:#fff;opacity:.9}
#parser2 .btn-danger:active,#parser2 .btn-danger:hover{color:#fff;opacity:.9}
#parser2 .btn-info{color:#fff;background:#5bc0de}
#parser2 .btn-info:focus{color:#fff;background:#31b0d5}
#parser2 .btn-info:active,#parser2 .btn-info:hover{color:#fff;background:#31b0d5}
#parser2 .btn-xs{font-size:12px;line-height:1.5;border-radius:3px;padding:1px 5px}
#parser2 textarea#somewhere{border:1px solid rgba(0,0,0,0.05);height:300px;width:100%;margin:0 0 10px;box-sizing:border-box;font-family:Consolas,Monaco,'Andale Mono',monospace;color:#111;border-radius:8px;padding:20px;transition:all .6s}
#parser2 textarea#somewhere:active,#parser2 textarea#somewhere:focus{border-color:rgba(0,0,0,0.15);outline:0}
#parser2 .btn-sm{display:inline-block;font-size:13px;line-height:1.5;border-radius:5px;padding:12px;margin:0 auto 10px auto;width:30%;box-shadow:0 3px 1.2rem -0.8rem rgba(0,0,0,0.8)}
#parser2 .btn-xs{font-size:13px;line-height:1.5;border-radius:5px;padding:12px;margin:auto;width:30%;box-shadow:0 3px 1.2rem -0.8rem rgba(0,0,0,0.8)}
.collapse{display:none}
.alert-success{color:#222;background:#fff}
.alert{border:0;padding:5px 15px;border-radius:10px;position:absolute;top:20px;right:20px;min-width:210px;color:#0984e3;font-size:13px;box-shadow:0 2px 4px 0 rgba(0,0,0,0.16)}
button.close{padding:0;cursor:pointer;background:none;border:0;-webkit-appearance:none}
.close{float:right;font-size:1.3rem;color:#0984e3;margin:1px 0 0 0}
button.close:focus{outline:0}
.close:hover{opacity:1!important}
#btnInfo h4{margin:0;font-size:13px;line-height:2}
#button-link{display:none}
.clear{clear:both;display:block;margin-bottom:2px}
.alert br{display:none}
</style>
<br />
<div id="parser2"><textarea id="somewhere" placeholder="Write/paste the code here then click the Parse Code button"></textarea><br />
<div class="alert alert-success margin-bottom-20 collapse" id="btnInfo" role="alert"><button class="close close-copy" onclick="document.getElementById(&quot;btnInfo&quot;).style.display = &quot;none&quot;;cdClear();" type="button"><span aria-hidden="true">&#215;</span></button> <br />
<h4>Code copied to clipboard</h4></div><button class="btn btn-primary btn-sm btn-parse" onclick="convert();" type="button">Parse Code</button> <br />
<div class="clear"></div><button class="btn button-link btn-xs btn-info" data-clipboard-action="copy" data-clipboard-target="#somewhere" id="button-link" type="submit">Copy Code to Clipboard</button> <button class="btn btn-danger btn-xs" id="btn_clear" onclick="cdClear();">Clean</button> </div>
<script type="text/javascript">
//<![CDATA[
function convert() {
    var ele1 = document.getElementById("somewhere");
    var replaced;
    replaced = ele1.value;
    replaced = replaced.replace(/&/ig, "&amp;");
    replaced = replaced.replace(/</ig, "&lt;");
    replaced = replaced.replace(/>/ig, "&gt;");
    replaced = replaced.replace(/"/ig, "&quot;");
    replaced = replaced.replace(/'/ig, "&#039;");
    replaced = replaced.replace(/&#177;/ig, "&plusmn;");
    replaced = replaced.replace(/&#169;/ig, "&copy;");
    replaced = replaced.replace(/&#174;/ig, "&reg;");
    replaced = replaced.replace(/ya'll/ig, "ya'll");
    ele1.value = replaced;
	document.getElementById("button-link")
        .style.display = "inline-block";
    document.getElementById("btn_clear")
        .style.display = "inline-block";
}
function cdClear() {
  var wtarea = document.getElementById('somewhere');
  wtarea.value = '';
  document.getElementById("btnInfo")
        .style.display = "none",document.getElementById("button-link")
        .style.display = "none"
}

/*!
 * clipboard.js v1.5.16
 * https://zenorocha.github.io/clipboard.js
 *
 * Licensed MIT © Zeno Rocha
 */
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var clipboard = new Clipboard(".button-link");
clipboard.on("success", function (o) {
    console.log(o), document.getElementById("btnInfo")
        .style.display = "block", document.getElementById("somewhere")
        .value = ""
}), clipboard.on("error", function (o) {
    console.log(o)
});
//]]></script>