chrome://snippets-internals page for debugging NTP snippets.

chrome/browser/resources/snippets_internals.css

+/* Copyright 2016 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+html {
+  font-size: 20px;
+}
+
+#info > div {
+  width: 100%;
+}
+
+#info h2 {
+  color: rgb(74, 142, 230);
+  font-size: 100%;
+  margin-bottom: 0.3em;
+  margin-top: 1em;
+}
+
+#info .section {
+  display: inline-block;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+.section-details {
+  width: 100%;
+}
+
+.section-details .detail,
+.section-details .value {
+  width: 50%;
+}
+
+td.title-link {
+  padding-bottom: 0.5em;
+  padding-top: 0.5em;
+}
+
+.expiry {
+  color: gray;
+  font-size: 80%;
+}
+
+.date {
+  white-space: nowrap;
+}
+
+.url {
+  display: inline-block;
+  font-size: 80%;
+  word-break: break-all;
+}
+
+.snippet-detail {
+  font-size: 90%;
+}
+
+.snippet-hidden {
+  display: none;
+}
+
+table.section-details > tbody > tr:nth-child(odd) {
+  background: rgb(239, 243, 255);
+}
+
+.detail {
+  color: gray;
+  font-weight: normal;
+}
+
+.forms {
+  margin-top: 0.3em;
+}
+
+#submit-clear {
+  margin-bottom: 0.5em;
+}