diff --git a/mne/data/html_templates.py b/mne/data/html_templates.py
index e1943fe0e0d..304abc731a1 100644
--- a/mne/data/html_templates.py
+++ b/mne/data/html_templates.py
@@ -1,20 +1,30 @@
+import uuid
 from ..externals.tempita import Template
 
-
 info_template = Template("""
+{{style}}
+
 <table class="table table-hover">
+
     <tr>
+        <th colspan="2" style="text-align: left;">
+        <label for={{section_ids[0]}}> {{sections[0]}} </label>
+        </th>
+    </tr>
+
+    <tr class="{{section_ids[0]}}">
         <th>Measurement date</th>
         {{if meas_date is not None}}
         <td>{{meas_date}}</td>
         {{else}}<td>Unknown</td>{{endif}}
     </tr>
-    <tr>
+    <tr class="{{section_ids[0]}}">
         <th>Experimenter</th>
         {{if info['experimenter'] is not None}}
         <td>{{info['experimenter']}}</td>
         {{else}}<td>Unknown</td>{{endif}}
     </tr>
+    <tr  class="{{section_ids[0]}}">
         <th>Participant</th>
         {{if info['subject_info'] is not None}}
             {{if 'his_id' in info['subject_info'].keys()}}
@@ -22,7 +32,14 @@
             {{endif}}
         {{else}}<td>Unknown</td>{{endif}}
     </tr>
+
     <tr>
+        <th colspan="2" style="text-align: left;">
+        <label for={{section_ids[1]}}> {{sections[1]}} </label>
+        </th>
+    </tr>
+
+    <tr  class="{{section_ids[1]}}">
         <th>Digitized points</th>
         {{if info['dig'] is not None}}
         <td>{{len(info['dig'])}} points</td>
@@ -30,49 +47,55 @@
         <td>Not available</td>
         {{endif}}
     </tr>
-    <tr>
+    <tr  class="{{section_ids[1]}}">
         <th>Good channels</th>
         <td>{{n_mag}} magnetometer, {{n_grad}} gradiometer,
             and {{n_eeg}} EEG channels</td>
     </tr>
-    <tr>
+    <tr  class="{{section_ids[1]}}">
         <th>Bad channels</th>
         {{if info['bads'] is not None}}
         <td>{{', '.join(info['bads'])}}</td>
         {{else}}<td>None</td>{{endif}}
     </tr>
-    <tr>
+    <tr  class="{{section_ids[1]}}">
         <th>EOG channels</th>
         <td>{{eog}}</td>
     </tr>
-    <tr>
+    <tr  class="{{section_ids[1]}}">
         <th>ECG channels</th>
         <td>{{ecg}}</td>
+    </tr>
+
     <tr>
+        <th colspan="2" style="text-align: left;">
+        <label for={{section_ids[2]}}> {{sections[2]}} </label>
+        </th>
+    </tr>
+    <tr  class="{{section_ids[2]}}">
         <th>Sampling frequency</th>
         <td>{{u'%0.2f' % info['sfreq']}} Hz</td>
     </tr>
-    <tr>
+    <tr  class="{{section_ids[2]}}">
         <th>Highpass</th>
         <td>{{u'%0.2f' % info['highpass']}} Hz</td>
     </tr>
-     <tr>
+    <tr  class="{{section_ids[2]}}">
         <th>Lowpass</th>
         <td>{{u'%0.2f' % info['lowpass']}} Hz</td>
     </tr>
-</table>
-""")
-
-raw_template = Template("""
-{{info_repr[:-9]}}
-    <tr>
+    {{if filenames is not None}}
+    <tr  class="{{section_ids[2]}}">
         <th>Filenames</th>
         <td>{{', '.join(filenames)}}</td>
     </tr>
-    <tr>
+    {{endif}}
+    {{if duration is not None}}
+    <tr  class="{{section_ids[2]}}">
         <th>Duration</th>
         <td>{{duration}} (HH:MM:SS)</td>
     </tr>
+    {{endif}}
 </table>
 """)
 
@@ -100,3 +123,46 @@
     </tr>
 </table>
 """)
+
+
+def _section_style(section_id):
+    """Set CSS style for collapsible section's label."""
+    html = f"""#{section_id} ~ table [for="{section_id}"]::before {{
+                   display: inline-block;
+                   content: "►";
+                   font-size: 11px;
+                   width: 15px;
+                   text-align: left;
+                   }}
+
+               #{section_id}:checked ~ table [for="{section_id}"]::before {{
+                   content: "▼";
+                   }}
+
+               #{section_id} ~ table tr.{section_id} {{
+                   visibility: collapse;
+                   }}
+
+               #{section_id}:checked ~ table tr.{section_id} {{
+                   visibility: visible;
+                   }}
+            """
+    return html
+
+
+def _collapsible_sections_reprt_html(sections):
+    """Set style and unique ID for all collapsible sections."""
+    style = "<style>  label { cursor: pointer; }"
+    ids_ = []
+    for section in sections:
+        section_id = f"section_{str(uuid.uuid4())}"
+        style += _section_style(section_id)
+        ids_.append(section_id)
+    style += "</style>"
+
+    for i in ids_:
+        style += f"""
+        <input type="checkbox" id="{i}" hidden aria-hidden="true"/>
+        """
+
+    return style, ids_
diff --git a/mne/io/base.py b/mne/io/base.py
index d12ba267652..36001804429 100644
--- a/mne/io/base.py
+++ b/mne/io/base.py
@@ -52,7 +52,6 @@
 from ..viz import plot_raw, plot_raw_psd, plot_raw_psd_topo, _RAW_CLIP_DEF
 from ..event import find_events, concatenate_events
 from ..annotations import Annotations, _combine_annotations, _sync_onset
-from ..data.html_templates import raw_template
 
 
 class TimeMixin(object):
@@ -1709,9 +1708,8 @@ def _repr_html_(self, caption=None):
         m, s = divmod(self._last_time - self.first_time, 60)
         h, m = divmod(m, 60)
         duration = f'{int(h):02d}:{int(m):02d}:{int(s):02d}'
-        return raw_template.substitute(
-            info_repr=self.info._repr_html_(caption=caption),
-            filenames=basenames, duration=duration)
+        return self.info._repr_html_(
+            caption=caption, filenames=basenames, duration=duration)
 
     def add_events(self, events, stim_channel=None, replace=False):
         """Add events to stim channel.
diff --git a/mne/io/meas_info.py b/mne/io/meas_info.py
index 153578dc288..c527b077bd5 100644
--- a/mne/io/meas_info.py
+++ b/mne/io/meas_info.py
@@ -39,7 +39,8 @@
                             _dig_kind_rev, _dig_kind_ints, _read_dig_fif)
 from ._digitization import write_dig as _dig_write_dig
 from .compensator import get_current_comp
-from ..data.html_templates import info_template
+from ..data.html_templates import (info_template,
+                                   _collapsible_sections_reprt_html)
 
 b = bytes  # alias
 
@@ -809,7 +810,8 @@ def pick_channels(self, ch_names, ordered=False):
     def ch_names(self):
         return self['ch_names']
 
-    def _repr_html_(self, caption=None):
+    def _repr_html_(self, caption=None, filenames=None,
+                    duration=None):
         if isinstance(caption, str):
             html = f'<h4>{caption}</h4>'
         else:
@@ -831,9 +833,13 @@ def _repr_html_(self, caption=None):
         if meas_date is not None:
             meas_date = meas_date.strftime("%B %d, %Y  %H:%M:%S") + ' GMT'
 
+        sections = ['General', 'Channels', 'Data']
+        style, section_ids = _collapsible_sections_reprt_html(sections)
         html += info_template.substitute(
+            style=style, section_ids=section_ids, sections=sections,
             caption=caption, info=self, meas_date=meas_date, n_eeg=n_eeg,
-            n_grad=n_grad, n_mag=n_mag, eog=eog, ecg=ecg)
+            n_grad=n_grad, n_mag=n_mag, eog=eog, ecg=ecg, filenames=filenames,
+            duration=duration)
         return html
 
 
diff --git a/tutorials/intro/plot_20_events_from_raw.py b/tutorials/intro/plot_20_events_from_raw.py
index dca39323377..af621811b4d 100644
--- a/tutorials/intro/plot_20_events_from_raw.py
+++ b/tutorials/intro/plot_20_events_from_raw.py
@@ -11,7 +11,7 @@
 
 In the :ref:`introductory tutorial <overview-tut-events-section>` we saw an
 example of reading experimental events from a :term:`"STIM" channel <stim
-channel>`; here we'll discuss :term:`events` and :term:`annotations` more
+channel>`; here we will discuss :term:`events` and :term:`annotations` more
 broadly, give more detailed information about reading from STIM channels, and
 give an example of reading events that are in a marker file or included in
 the data file as an embedded array. The tutorials :ref:`tut-event-arrays` and
diff --git a/tutorials/misc/plot_report.py b/tutorials/misc/plot_report.py
index 5db79181b14..29a64e34724 100644
--- a/tutorials/misc/plot_report.py
+++ b/tutorials/misc/plot_report.py
@@ -56,7 +56,7 @@
 #    will open the HTML in a new tab in the browser. To disable this, use the
 #    ``open_browser=False`` parameter of :meth:`~mne.Report.save`.
 #
-# For our first example, we'll generate a barebones report for all the
+# For our first example, we will generate a barebones report for all the
 # :file:`.fif` files containing raw data in the sample dataset, by passing the
 # pattern ``*raw.fif`` to :meth:`~mne.Report.parse_folder`. We'll omit the
 # ``subject`` and ``subjects_dir`` parameters from the :class:`~mne.Report`