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<ol>Crea liste ordinate o numerate.
enctypeDetermina il tipo di codifica dei dati di un form per l'invio al server
<blockquote>Inserisce citazioni in un documento HTML
widthImposta la larghezza di un elemento HTML
autoplayAttributo HTML autoplay per l'avvio automatico degli elementi audio e video
checkedPre-imposta su 'true' il valore di un elemento input checkbox o radio

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<select multiple=""  id="lists" name="attributi_list[]" class="form-control my-3" style="height: 300px;">
  <option selected value="68">value
  </option>
  <option value="57">type
  </option>
  <option value="52">title
  </option>
  <option value="56">target
  </option>
  <option value="51">src
  </option>
  <option value="63">size
  </option>
  <option value="67">selected
  </option>
  <option value="48">rowspan
  </option>
  <option value="62">required
  </option>
  <option value="55">rel
  </option>
  <option value="83">novalidate
  </option>
  <option value="50">name
  </option>
  <option value="61">multiple
  </option>
  <option value="82">method
  </option>
  <option value="71">media
  </option>
  <option value="70">hreflang
  </option>
  <option value="54">href
  </option>
  <option value="49">headers
  </option>
  <option value="89">formaction
  </option>
  <option value="64">form
  </option>
  <option value="76">for
  </option>
  <option value="81">enctype
  </option>
  <option value="53">download
  </option>
  <option value="60">disabled
  </option>
  <option value="88">dirname
  </option>
  <option value="69">crossorigin
  </option>
  <option value="47">colspan
  </option>
  <option value="87">checked
  </option>
  <option value="65">autofocus
  </option>
  <option value="80">autocomplete
  </option>
  <option value="79">action
  </option>
  <option value="78">accept-charset
  </option>
  <option value="86">accept
  </option>
  <option value="22">&lt;ul&gt;
  </option>
  <option value="20">&lt;u&gt;
  </option>
  <option value="44">&lt;tr&gt;
  </option>
  <option value="25">&lt;title&gt;
  </option>
  <option value="72">&lt;thead&gt;
  </option>
  <option value="46">&lt;th&gt;
  </option>
  <option value="74">&lt;tfoot&gt;
  </option>
  <option value="45">&lt;td&gt;
  </option>
  <option value="73">&lt;tbody&gt;
  </option>
  <option value="43">&lt;table&gt;
  </option>
  <option value="18">&lt;strong&gt;
  </option>
  <option value="59">&lt;select&gt;
  </option>
  <option value="38">&lt;q&gt;
  </option>
  <option value="36">&lt;pre&gt;
  </option>
  <option value="11">&lt;p&gt;
  </option>
  <option value="66">&lt;option&gt;
  </option>
  <option value="23">&lt;ol&gt;
  </option>
  <option value="28">&lt;nav&gt;
  </option>
  <option value="35">&lt;meta&gt;
  </option>
  <option value="40">&lt;map&gt;
  </option>
  <option value="58">&lt;link&gt;
  </option>
  <option value="24">&lt;li&gt;
  </option>
  <option value="75">&lt;label&gt;
  </option>
  <option value="85">&lt;input&gt;
  </option>
  <option value="10">&lt;iframe&gt;
  </option>
  <option value="16">&lt;i&gt;
  </option>
  <option value="1">&lt;html&gt;
  </option>
  <option value="21">&lt;hr&gt;
  </option>
  <option value="13">&lt;head&gt;
  </option>
  <option value="34">&lt;h6&gt;
  </option>
  <option value="33">&lt;h5&gt;
  </option>
  <option value="32">&lt;h4&gt;
  </option>
  <option value="31">&lt;h3&gt;
  </option>
  <option value="30">&lt;h2&gt;
  </option>
  <option value="29">&lt;h1&gt;
  </option>
  <option value="84">&lt;form&gt;
  </option>
  <option value="15">&lt;em&gt;
  </option>
  <option value="14">&lt;div&gt;
  </option>
  <option value="77">&lt;datalist&gt;
  </option>
  <option value="27">&lt;cite&gt;
  </option>
  <option value="42">&lt;caption&gt;
  </option>
  <option value="19">&lt;br&gt;
  </option>
  <option value="12">&lt;body&gt;
  </option>
  <option value="39">&lt;blockquote&gt;
  </option>
  <option value="41">&lt;base&gt;
  </option>
  <option value="17">&lt;b&gt;
  </option>
  <option value="37">&lt;address&gt;
  </option>
  <option value="26">&lt;abbr&gt;
  </option>
  <option value="9">&lt;a&gt;
  </option>
  <option value="8">&lt;!doctype&gt;
  </option>
  <option value="5">&lt;!-- --&gt;
  </option>        
</select>
<div id="selected">
  
</div>

*{ }

var list = document.getElementById("lists");
var listOf = document.getElementById("selected");
var opt = list.getElementsByTagName("option");


list.addEventListener("click", function(){
  let count = 0;
  let alltags = "";
  listOf.innerHTML = "";
  for(i=0; i< opt.length; i++){ 
    if(opt[i].selected == true){
      let tag;
      tag = htmltoString(opt[i].innerHTML);
      alltags += "<span>" + tag + "</span> ";
      count++;
    }
  }
  listOf.innerHTML = alltags + " (Tot:"+count+")";
})

function htmlEntities(str) {
    return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
} 
function htmltoString(str) {
    return String(str).replace(/(<([^>]+)>)/gi, "");
}