Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/comment/js/comment-by-viewer.js

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+/**
+ * @file
+ * Attaches behaviors for the Comment module's "by-viewer" class.
+ */
+
+(function ($, Drupal, drupalSettings) {
+
+  "use strict";
+
+  /**
+   * Add 'by-viewer' class to comments written by the current user.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.commentByViewer = {
+    attach: function (context) {
+      var currentUserID = parseInt(drupalSettings.user.uid, 10);
+      $('[data-comment-user-id]')
+        .filter(function () {
+          return parseInt(this.getAttribute('data-comment-user-id'), 10) === currentUserID;
+        })
+        .addClass('by-viewer');
+    }
+  };
+
+})(jQuery, Drupal, drupalSettings);

core/modules/comment/js/comment-new-indicator.js

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+/**
+ * @file
+ * Attaches behaviors for the Comment module's "new" indicator.
+ *
+ * May only be loaded for authenticated users, with the History module
+ * installed.
+ */
+
+(function ($, Drupal, window) {
+
+  "use strict";
+
+  /**
+   * Render "new" comment indicators wherever necessary.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.commentNewIndicator = {
+    attach: function (context) {
+      // Collect all "new" comment indicator placeholders (and their corresponding
+      // node IDs) newer than 30 days ago that have not already been read after
+      // their last comment timestamp.
+      var nodeIDs = [];
+      var $placeholders = $(context)
+        .find('[data-comment-timestamp]')
+        .once('history')
+        .filter(function () {
+          var $placeholder = $(this);
+          var commentTimestamp = parseInt($placeholder.attr('data-comment-timestamp'), 10);
+          var nodeID = $placeholder.closest('[data-history-node-id]').attr('data-history-node-id');
+          if (Drupal.history.needsServerCheck(nodeID, commentTimestamp)) {
+            nodeIDs.push(nodeID);
+            return true;
+          }
+          else {
+            return false;
+          }
+        });
+
+      if ($placeholders.length === 0) {
+        return;
+      }
+
+      // Fetch the node read timestamps from the server.
+      Drupal.history.fetchTimestamps(nodeIDs, function () {
+        processCommentNewIndicators($placeholders);
+      });
+    }
+  };
+
+  function processCommentNewIndicators($placeholders) {
+    var isFirstNewComment = true;
+    var newCommentString = Drupal.t('new');
+    var $placeholder;
+
+    $placeholders.each(function (index, placeholder) {
+      $placeholder = $(placeholder);
+      var timestamp = parseInt($placeholder.attr('data-comment-timestamp'), 10);
+      var $node = $placeholder.closest('[data-history-node-id]');
+      var nodeID = $node.attr('data-history-node-id');
+      var lastViewTimestamp = Drupal.history.getLastRead(nodeID);
+
+      if (timestamp > lastViewTimestamp) {
+        // Turn the placeholder into an actual "new" indicator.
+        var $comment = $(placeholder)
+          .removeClass('hidden')
+          .text(newCommentString)
+          .closest('.comment')
+          // Add 'new' class to the comment, so it can be styled.
+          .addClass('new');
+
+        // Insert "new" anchor just before the "comment-<cid>" anchor if
+        // this is the first new comment in the DOM.
+        if (isFirstNewComment) {
+          isFirstNewComment = false;
+          $comment.prev().before('<a id="new" />');
+          // If the URL points to the first new comment, then scroll to that
+          // comment.
+          if (window.location.hash === '#new') {
+            window.scrollTo(0, $comment.offset().top - Drupal.displace.offsets.top);
+          }
+        }
+      }
+    });
+  }
+
+})(jQuery, Drupal, window);

core/modules/comment/js/node-new-comments-link.js

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+/**
+ * @file
+ * Attaches behaviors for the Comment module's "X new comments" link.
+ *
+ * May only be loaded for authenticated users, with the History module
+ * installed.
+ */
+
+(function ($, Drupal) {
+
+  "use strict";
+
+  /**
+   * Render "X new comments" links wherever necessary.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.nodeNewCommentsLink = {
+    attach: function (context) {
+      // Collect all "X new comments" node link placeholders (and their
+      // corresponding node IDs) newer than 30 days ago that have not already been
+      // read after their last comment timestamp.
+      var nodeIDs = [];
+      var $placeholders = $(context)
+        .find('[data-history-node-last-comment-timestamp]')
+        .once('history')
+        .filter(function () {
+          var $placeholder = $(this);
+          var lastCommentTimestamp = parseInt($placeholder.attr('data-history-node-last-comment-timestamp'), 10);
+          var nodeID = $placeholder.closest('[data-history-node-id]').attr('data-history-node-id');
+          if (Drupal.history.needsServerCheck(nodeID, lastCommentTimestamp)) {
+            nodeIDs.push(nodeID);
+            // Hide this placeholder link until it is certain we'll need it.
+            hide($placeholder);
+            return true;
+          }
+          else {
+            // Remove this placeholder link from the DOM because we won't need it.
+            remove($placeholder);
+            return false;
+          }
+        });
+
+      if ($placeholders.length === 0) {
+        return;
+      }
+
+      // Perform an AJAX request to retrieve node read timestamps.
+      Drupal.history.fetchTimestamps(nodeIDs, function () {
+        processNodeNewCommentLinks($placeholders);
+      });
+    }
+  };
+
+  function hide($placeholder) {
+    return $placeholder
+      // Find the parent <li>.
+      .closest('.comment-new-comments')
+      // Find the preceding <li>, if any, and give it the 'last' class.
+      .prev().addClass('last')
+      // Go back to the parent <li> and hide it.
+      .end().hide();
+  }
+
+  function remove($placeholder) {
+    hide($placeholder).remove();
+  }
+
+  function show($placeholder) {
+    return $placeholder
+      // Find the parent <li>.
+      .closest('.comment-new-comments')
+      // Find the preceding <li>, if any, and remove its 'last' class, if any.
+      .prev().removeClass('last')
+      // Go back to the parent <li> and show it.
+      .end().show();
+  }
+
+  function processNodeNewCommentLinks($placeholders) {
+    // Figure out which placeholders need the "x new comments" links.
+    var $placeholdersToUpdate = {};
+    var fieldName = 'comment';
+    var $placeholder;
+    $placeholders.each(function (index, placeholder) {
+      $placeholder = $(placeholder);
+      var timestamp = parseInt($placeholder.attr('data-history-node-last-comment-timestamp'), 10);
+      fieldName = $placeholder.attr('data-history-node-field-name');
+      var nodeID = $placeholder.closest('[data-history-node-id]').attr('data-history-node-id');
+      var lastViewTimestamp = Drupal.history.getLastRead(nodeID);
+
+      // Queue this placeholder's "X new comments" link to be downloaded from the
+      // server.
+      if (timestamp > lastViewTimestamp) {
+        $placeholdersToUpdate[nodeID] = $placeholder;
+      }
+      // No "X new comments" link necessary; remove it from the DOM.
+      else {
+        remove($placeholder);
+      }
+    });
+
+    // Perform an AJAX request to retrieve node view timestamps.
+    var nodeIDs = Object.keys($placeholdersToUpdate);
+    if (nodeIDs.length === 0) {
+      return;
+    }
+
+    // Render the "X new comments" links. Either use the data embedded in the page
+    // or perform an AJAX request to retrieve the same data.
+    function render(results) {
+      for (var nodeID in results) {
+        if (results.hasOwnProperty(nodeID) && $placeholdersToUpdate.hasOwnProperty(nodeID)) {
+          $placeholdersToUpdate[nodeID]
+            .attr('href', results[nodeID].first_new_comment_link)
+            .text(Drupal.formatPlural(results[nodeID].new_comment_count, '1 new comment', '@count new comments'))
+            .removeClass('hidden');
+          show($placeholdersToUpdate[nodeID]);
+        }
+      }
+    }
+
+    if (drupalSettings.comment && drupalSettings.comment.newCommentsLinks) {
+      render(drupalSettings.comment.newCommentsLinks.node[fieldName]);
+    }
+    else {
+      $.ajax({
+        url: Drupal.url('comments/render_new_comments_node_links'),
+        type: 'POST',
+        data: {'node_ids[]': nodeIDs, 'field_name': fieldName},
+        dataType: 'json',
+        success: render
+      });
+    }
+  }
+
+})(jQuery, Drupal);