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HTML

              
                <!-- HTML SÓLO DE EJEMPLO, COPIADO TAL CUAL DE UNA PAGINA BLOGGER -->
<div class="comments" id="comments">
<a name="comments"></a>
<h4>
1 comentario
                      :
                    </h4>
<div class="comments-content">
<script async="async" src="//www.blogblog.com/dynamicviews/4224c15c4e7c9321/js/comments.js" type="text/javascript"></script>
<script type="text/javascript">
                    (function() {
                      var items = [{'id': '2488855270506141639', 'body': 'Un enlace a la \x3ca href\x3d\x22https://3.bp.blogspot.com/-6xN4sEokNLI/Uhewc_hRZTI/AAAAAAAALrU/JqEGqg9Dboo/w640-h200-c/wizard.jpg\x22 rel\x3d\x22nofollow\x22\x3eimagen1\x3c/a\x3e\x3cbr /\x3e\x3cbr /\x3eImagen solo con dirección https://3.bp.blogspot.com/-6xN4sEokNLI/Uhewc_hRZTI/AAAAAAAALrU/JqEGqg9Dboo/w640-h200-c/wizard.jpg\x3cbr /\x3e\x3cbr /\x3eImagen con IMG [img]https://lh3.googleusercontent.com/-6qmXITahg04/TYEE3OaVDfI/AAAAAAAAABI/zoQvYPZWq6U/w500-h100-c/alice+in+wonderland.jpg[/img]\x3cbr /\x3e\x3cbr /\x3eOtra sin nada https://1.bp.blogspot.com/-sQLZ-ROi6sc/VXC6k8JbLqI/AAAAAAAAT3g/jbdl7HF9x5I/w640-h200-c/war-of-the-worlds-xbla-psn-title.jpg\x3cbr /\x3e\x3cbr /\x3eUn enlace a la \x3ca href\x3d\x22https://3.bp.blogspot.com/-6xN4sEokNLI/Uhewc_hRZTI/AAAAAAAALrU/JqEGqg9Dboo/w640-h200-c/wizard.jpg\x22 rel\x3d\x22nofollow\x22\x3eimagen1\x3c/a\x3e\x3cbr /\x3e', 'timestamp': '1493665425292', 'permalink': 'https://singenio.blogspot.com/2017/05/esta-es-muy-breve.html?showComment\x3d1493665425292#c2488855270506141639', 'author': {'name': 'Oloman', 'avatarUrl': '//lh4.googleusercontent.com/-o0SQYyH4kDM/AAAAAAAAAAI/AAAAAAAAbv4/my-v3sAWv6I/s35-c/photo.jpg', 'profileUrl': 'https://www.blogger.com/profile/01957235221463243588'}, 'displayTime': '1/5/17 21:03', 'deleteclass': 'item-control blog-admin pid-1088010323'}];
                      var msgs = {'loadMore': 'Cargar más...', 'loading': 'Cargando...', 'loaded': 'Ya no hay más', 'addComment': 'Añadir comentario', 'reply': 'Responder', 'delete': 'Eliminar'};
                      var config = {'blogId': '420527437610051610', 'postId': '4132222296208029985', 'feed': 'https://singenio.blogspot.com/feeds/4132222296208029985/comments/default', 'authorName': 'Oloman', 'authorUrl': 'https://www.blogger.com/profile/01957235221463243588', 'baseUri': 'https://www.blogger.com', 'maxThreadDepth': 2};
                      // <![CDATA[
                      var cursor = null;
                      if (items && items.length > 0) {
                        cursor = parseInt(items[items.length - 1].timestamp) + 1;
                      }
                      var bodyFromEntry = function(entry) {
                        if (entry.gd$extendedProperty) {
                          for (var k in entry.gd$extendedProperty) {
                            if (entry.gd$extendedProperty[k].name == 'blogger.contentRemoved') {
                              return '<span class="deleted-comment">' + entry.content.$t + '</span>';
                            }
                          }
                        }
                        return entry.content.$t;
                      }
                      var parse = function(data) {
                        cursor = null;
                        var comments = [];
                        if (data && data.feed && data.feed.entry) {
                          for (var i = 0, entry; entry = data.feed.entry[i]; i++) {
                            var comment = {};
                            // comment ID, parsed out of the original id format
                            var id = /blog-(\d+).post-(\d+)/.exec(entry.id.$t);
                            comment.id = id ? id[2] : null;
                            comment.body = bodyFromEntry(entry);
                            comment.timestamp = Date.parse(entry.published.$t) + '';
                            if (entry.author && entry.author.constructor === Array) {
                              var auth = entry.author[0];
                              if (auth) {
                                comment.author = {
                                  name: (auth.name ? auth.name.$t : undefined),
                                  profileUrl: (auth.uri ? auth.uri.$t : undefined),
                                  avatarUrl: (auth.gd$image ? auth.gd$image.src : undefined)
                                };
                              }
                            }
                            if (entry.link) {
                              if (entry.link[2]) {
                                comment.link = comment.permalink = entry.link[2].href;
                              }
                              if (entry.link[3]) {
                                var pid = /.*comments\/default\/(\d+)\?.*/.exec(entry.link[3].href);
                                if (pid && pid[1]) {
                                  comment.parentId = pid[1];
                                }
                              }
                            }
                            comment.deleteclass = 'item-control blog-admin';
                            if (entry.gd$extendedProperty) {
                              for (var k in entry.gd$extendedProperty) {
                                if (entry.gd$extendedProperty[k].name == 'blogger.itemClass') {
                                  comment.deleteclass += ' ' + entry.gd$extendedProperty[k].value;
                                } else if (entry.gd$extendedProperty[k].name == 'blogger.displayTime') {
                                  comment.displayTime = entry.gd$extendedProperty[k].value;
                                }
                              }
                            }
                            comments.push(comment);
                          }
                        }
                        return comments;
                      };
                      var paginator = function(callback) {
                        if (hasMore()) {
                          var url = config.feed + '?alt=json&v=2&orderby=published&reverse=false&max-results=50';
                          if (cursor) {
                            url += '&published-min=' + new Date(cursor).toISOString();
                          }
                          window.bloggercomments = function(data) {
                            var parsed = parse(data);
                            cursor = parsed.length < 50 ? null
                            : parseInt(parsed[parsed.length - 1].timestamp) + 1
                            callback(parsed);
                            window.bloggercomments = null;
                          }
                          url += '&callback=bloggercomments';
                          var script = document.createElement('script');
                          script.type = 'text/javascript';
                          script.src = url;
                          document.getElementsByTagName('head')[0].appendChild(script);
                        }
                      };
                      var hasMore = function() {
                        return !!cursor;
                      };
                      var getMeta = function(key, comment) {
                        if ('iswriter' == key) {
                          var matches = !!comment.author
                          && comment.author.name == config.authorName
                          && comment.author.profileUrl == config.authorUrl;
                          return matches ? 'true' : '';
                        } else if ('deletelink' == key) {
                          return config.baseUri + '/delete-comment.g?blogID='
                          + config.blogId + '&postID=' + comment.id;
                        } else if ('deleteclass' == key) {
                          return comment.deleteclass;
                        }
                        return '';
                      };
                      var replybox = null;
                      var replyUrlParts = null;
                      var replyParent = undefined;
                      var onReply = function(commentId, domId) {
                        if (replybox == null) {
                          // lazily cache replybox, and adjust to suit this style:
                          replybox = document.getElementById('comment-editor');
                          if (replybox != null) {
                            replybox.height = '250px';
                            replybox.style.display = 'block';
                            replyUrlParts = replybox.src.split('#');
                          }
                        }
                        if (replybox && (commentId !== replyParent)) {
                          document.getElementById(domId).insertBefore(replybox, null);
                          replybox.src = replyUrlParts[0]
                          + (commentId ? '&parentID=' + commentId : '')
                          + '#' + replyUrlParts[1];
                          replyParent = commentId;
                        }
                      };
                      var hash = (window.location.hash || '#').substring(1);
                      var startThread, targetComment;
                      if (/^comment-form_/.test(hash)) {
                        startThread = hash.substring('comment-form_'.length);
                      } else if (/^c[0-9]+$/.test(hash)) {
                        targetComment = hash.substring(1);
                      }
                      // Configure commenting API:
                      var configJso = {
                        'maxDepth': config.maxThreadDepth
                      };
                      var provider = {
                        'id': config.postId,
                        'data': items,
                        'loadNext': paginator,
                        'hasMore': hasMore,
                        'getMeta': getMeta,
                        'onReply': onReply,
                        'rendered': true,
                        'initComment': targetComment,
                        'initReplyThread': startThread,
                        'config': configJso,
                        'messages': msgs
                      };
                      var render = function() {
                        if (window.goog && window.goog.comments) {
                          var holder = document.getElementById('comment-holder');
                          window.goog.comments.render(holder, provider);
                        }
                      };
                      // render now, or queue to render when library loads:
                      if (window.goog && window.goog.comments) {
                        render();
                      } else {
                        window.goog = window.goog || {};
                        window.goog.comments = window.goog.comments || {};
                        window.goog.comments.loadQueue = window.goog.comments.loadQueue || [];
                        window.goog.comments.loadQueue.push(render);
                      }
                    })();
                    // ]]>
                  </script>
<div id="comment-holder">

<div id="bc_0_2C" kind="c"><div id="bc_0_2CT"><div id="bc_0_1T" class="comment-thread" kind="r" t="0" u="0"><ol id="bc_0_1TB"><li id="bc_0_0B" class="comment" kind="b"><div class="avatar-image-container"><img src="//lh4.googleusercontent.com/-o0SQYyH4kDM/AAAAAAAAAAI/AAAAAAAAbv4/my-v3sAWv6I/s35-c/photo.jpg"></div><div id="c2488855270506141639" class="comment-block"><div id="bc_0_0M" class="comment-header" kind="m"><cite class="user blog-author"><a rel="nofollow" href="https://www.blogger.com/profile/01957235221463243588">Oloman</a></cite><span class="icon user blog-author"></span><span class="datetime secondary-text"><a rel="nofollow" href="https://singenio.blogspot.com/2017/05/esta-es-muy-breve.html?showComment=1493665425292#c2488855270506141639">1/5/17 21:03</a></span></div><p id="bc_0_0MC" class="comment-content">
 Imagen solo con dirección https://3.bp.blogspot.com/-6xN4sEokNLI/Uhewc_hRZTI/AAAAAAAALrU/JqEGqg9Dboo/w640-h200-c/wizard.jpg<br>
<br/>Video VIMEO https://vimeo.com/127423845
    <a href="https://www.youtube.com/watch?v=kJQP7kiw5Fk">https://www.youtube.com/watch?v=kJQP7kiw5Fk</a>
  <br>
Un enlace a la <a href="//3.bp.blogspot.com/-6xN4sEokNLI/Uhewc_hRZTI/AAAAAAAALrU/JqEGqg9Dboo/w640-h200-c/wizard.jpg" rel="nofollow">imagen1</a><br>
  https://youtu.be/kJQP7kiw5Fk
  <br>Otra sin nada https://1.bp.blogspot.com/-sQLZ-ROi6sc/VXC6k8JbLqI/AAAAAAAAT3g/jbdl7HF9x5I/w640-h200-c/war-of-the-worlds-xbla-psn-title.jpg<br><br>Un enlace a la <a href="//3.bp.blogspot.com/-6xN4sEokNLI/Uhewc_hRZTI/AAAAAAAALrU/JqEGqg9Dboo/w640-h200-c/wizard.jpg" rel="nofollow">imagen1</a><br></p><span id="bc_0_0MN" class="comment-actions secondary-text" kind="m"><a kind="i" href="javascript:;" target="_self" o="r">Responder</a><span class="item-control blog-admin pid-1088010323"><a o="d" target="_self" href="https://www.blogger.com/delete-comment.g?blogID=420527437610051610&amp;postID=2488855270506141639">Eliminar</a></span></span></div><div id="bc_0_0BR" class="comment-replies"></div><div id="bc_0_0B_box" class="comment-replybox-single"></div></li></ol><div id="bc_0_1I" class="continue" kind="ci"><a href="javascript:;" target="_self">Añadir comentario</a></div><div id="bc_0_1T_box" class="comment-replybox-thread"></div><div id="bc_0_1L" class="loadmore loaded" kind="rb"><a href="javascript:;" target="_self">Cargar más...</a></div></div></div></div></div>
</div>
<p class="comment-footer">
</p><div class="comment-form">
<a name="comment-form"></a>
<p>
</p>
<a href="https://www.blogger.com/comment-iframe.g?blogID=420527437610051610&amp;postID=4132222296208029985&amp;blogspotRpcToken=6542081" id="comment-editor-src"></a>
<iframe allowtransparency="true" class="blogger-iframe-colorize blogger-comment-from-post" frameborder="0" height="410px" id="comment-editor" name="comment-editor" src="https://www.blogger.com/comment-iframe.g?blogID=420527437610051610&amp;postID=4132222296208029985&amp;blogspotRpcToken=6542081#%7B%22color%22%3A%22rgb(51%2C%2051%2C%2051)%22%2C%22backgroundColor%22%3A%22rgb(255%2C%20255%2C%20255)%22%2C%22unvisitedLinkColor%22%3A%22rgb(186%2C%2062%2C%2081)%22%2C%22fontFamily%22%3A%22%5C%22Open%20Sans%5C%22%22%7D" width="100%" data-resized="true"></iframe>
<script src="https://www.blogger.com/static/v1/jsbin/2492300974-comment_from_post_iframe.js" type="text/javascript"></script>
<script type="text/javascript">
                      BLOG_CMT_createIframe('https://www.blogger.com/rpc_relay.html');
                    </script>
</div>
<p></p>
<div id="backlinks-container">
<div id="Blog1_backlinks-container">
</div>
</div>
</div>
              
            
!

CSS

              
                

              
            
!

JS

              
                //<![CDATA[
(function() {
  var regimg = /(\[img\])?((http:|https:)?\/\/\S*?\.(jpg|gif|png|bmp|jpeg]))(\[\/img\])?/gi;
  var regyt = /(\[vid\])?http(?:s?):\/\/(?:www\.)?youtu(?:be\.com\/watch\?v=|\.be\/)([\w\-\_]*)(&(amp;)?‌​[\w\?‌​=]*)?(\[\/vid\])?/gi;
  var regvim = /(\[vid\])?(http:|https:)?\/\/(vimeo.com)\/([0-9]*)(\[\/vid\])?/gi;
  //Capturar contenido comentarios
  var a = document.querySelectorAll(".comment-content"); 
  for (var i = 0; i < a.length; i++) {
    // Seleccionar enlaces
    var enlaces = a[i].getElementsByTagName("a");
    for (var j = 0; j < enlaces.length; j++) {
      // Si es un enlace de los que queremos manipular
      if (enlaces[j].href.match(regimg)||enlaces[j].href.match(regyt)||enlaces[j].href.match(regvim)) {
        // Eliminamos el HTML del enlace y dejamos sólo una URL
        var ele = document.createElement("span");
        ele.innerHTML = enlaces[j].href;
        var ref = enlaces[j];
        ref.parentNode.insertBefore(ele, ref);
        enlaces[j].href = "";
        enlaces[j].innerHTML = "";
      }
    }
    var c = a[i].innerHTML;
    // En cada tipo de URL, sustituimos esta por el HTML que muestra imagen o vídeo
    c = c.replace(regimg,'<img style="max-width: 100%; height: auto;display: blocK;margin: 10px auto;" src="$2"" alt=""/>');
    c = c.replace(regyt,'<div style="position:relative;width:100%;height:0;padding-bottom:56.25%;overflow:hidden;margin:20px auto;"><iframe style="position: absolute;width: 100%;height: 100%;top: 0;left: 0;" src="https://www.youtube.com/embed/$2" frameborder="0" allowfullscreen></iframe></div>');
    c = c.replace(regvim,'<div style="position:relative;width:100%;height:0;padding-bottom:56.25%;overflow:hidden;margin:20px auto;"><iframe style="position: absolute;width: 100%;height: 100%;top: 0;left: 0;" src="https://player.vimeo.com/video/$4" frameborder="0" allowfullscreen></iframe></div>');    
    a[i].innerHTML = c;
  }
})();
//]]>

              
            
!
999px

Console