diff --git a/instances/templates/create_instance_w2.html b/instances/templates/create_instance_w2.html
index 22876f10..8b38749f 100644
--- a/instances/templates/create_instance_w2.html
+++ b/instances/templates/create_instance_w2.html
@@ -323,7 +323,7 @@
                                         <td style="width:5px;">
                                             <form action="{% url 'instances:flavor_delete' flavor.id %}" method="post" role="form" aria-label="Delete flavor form">
                                                 {% csrf_token %}
-                                                <button type="submit" class="btn btn-sm btn-secondary" name="delete_flavor" title="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                                <button type="submit" class="btn btn-sm btn-secondary" name="delete_flavor" title="{% trans "Delete" %}" data-confirm="{% blocktrans with name=flavor.label %}Delete flavor {{ name }}? Only the size template goes; VMs made from it keep their size.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                                     {% bs_icon 'trash' %}
                                                 </button>
                                             </form>
diff --git a/instances/templates/instances/edit_instance_volume.html b/instances/templates/instances/edit_instance_volume.html
index 7e93cff1..d4aff411 100644
--- a/instances/templates/instances/edit_instance_volume.html
+++ b/instances/templates/instances/edit_instance_volume.html
@@ -109,7 +109,7 @@
                 <div class="clearfix"></div>
                 <div class="modal-footer">
                     <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">{% trans "Close" %}</button>
-                    <button type="submit" class="btn btn-success" name="edit_volume" onclick="return confirm('{% trans "Are you sure to change volume properties?" %}')">{% trans "Save" %}</button>
+                    <button type="submit" class="btn btn-success" name="edit_volume">{% trans "Save" %}</button>
                 </div><!-- /.modal-footer -->
 
             </div> <!-- /.modal-content -->
diff --git a/instances/templates/instances/settings_tab.html b/instances/templates/instances/settings_tab.html
index 09dd4f7d..e8ebf056 100644
--- a/instances/templates/instances/settings_tab.html
+++ b/instances/templates/instances/settings_tab.html
@@ -312,11 +312,11 @@
                                         <input type="hidden" name="storage" value="{{ disk.storage }}">
                                         <input type="hidden" name="name" value="{{ disk.image }}">
                                         {% if instance.status == 5 %}
-                                            <button type="submit" class="btn btn-sm btn-secondary" value="{{ disk.dev }}" title="{% trans "Detach" %}" onclick="return confirm('{% trans "Are you sure to detach volume?" %}')">
+                                            <button type="submit" class="btn btn-sm btn-secondary" value="{{ disk.dev }}" title="{% trans "Detach" %}" data-confirm="{% blocktrans with dev=disk.dev %}Detach {{ dev }}? Its file is kept.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                                 {% bs_icon 'eject' %}
                                             </button>
                                         {% else %}
-                                            <button class="btn btn-sm btn-secondary disabled" disabled value="{{ disk.dev }}" title="{% trans "Detach" %}" onclick="return confirm('{% trans "Are you sure? This may lead data corruption!" %}')">
+                                            <button class="btn btn-sm btn-secondary disabled" disabled value="{{ disk.dev }}" title="{% trans "Detach" %}">
                                                 {% bs_icon 'eject' %}
                                             </button>
                                         {% endif %}
@@ -328,11 +328,11 @@
                                         <input type="hidden" name="storage" value="{{ disk.storage }}">
                                         <input type="hidden" name="name" value="{{ disk.image }}">
                                         {% if instance.status == 5 %}
-                                            <button type="submit" class="btn btn-sm btn-secondary" title="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure to delete volume?" %}')">
+                                            <button type="submit" class="btn btn-sm btn-secondary" title="{% trans "Delete" %}" data-confirm="{% blocktrans with dev=disk.dev %}Delete {{ dev }}? It is detached and its file and data are removed.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                                 {% bs_icon 'trash' %}
                                             </button>
                                         {% else %}
-                                            <button class="btn btn-sm btn-secondary disabled" disabled title="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure? This may lead data corruption!" %}')">
+                                            <button class="btn btn-sm btn-secondary disabled" disabled title="{% trans "Delete" %}">
                                                 {% bs_icon 'trash' %}
                                             </button>
                                         {% endif %}
@@ -478,7 +478,7 @@
                                 <td>
                                     <form action="{% url 'instances:delete_network' instance.id %}" method="post" name="delete_network" role="form">{% csrf_token %}
                                         <button class="btn btn-sm btn-danger" value="{{ network.mac }}" name="delete_network" title="{% trans "Delete Device" %}"
-                                            onclick="return confirm('{% trans "Are you sure?" %}')">
+ data-confirm="{% blocktrans with mac=network.mac %}Remove network card {{ mac }}? A running VM loses its connection through it at once.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                             {% bs_icon 'trash' %}
                                         </button>
                                     </form>
@@ -556,7 +556,7 @@
                                                 <input name="net-mac" value="{{ q }}" hidden/>
                                                 <button type="submit" class="btn btn-sm btn-primary"
                                                         name="set_qos" data-bs-toggle="modal"
-                                                        title="{% trans "Edit QoS" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                                        title="{% trans "Edit QoS" %}">
                                                     <span>{% bs_icon 'save' %} </span>
                                                 </button>
                                         </form>
@@ -566,7 +566,7 @@
                                                     <input name="net-mac" value="{{ q }}" hidden/>
                                                     <button type="submit" class="btn btn-sm btn-danger"
                                                             name="unset_qos"
-                                                            title="{% trans "Delete QoS" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                                            title="{% trans "Delete QoS" %}" data-confirm="{% blocktrans with direction=att.direction mac=q %}Remove the {{ direction }} limit of {{ mac }}? A running VM keeps it until it is powered off and on.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                                             {% bs_icon 'trash' %}
                                                     </button>
                                                 </form>
diff --git a/instances/templates/instances/snapshots_tab.html b/instances/templates/instances/snapshots_tab.html
index 40592410..d21797a2 100755
--- a/instances/templates/instances/snapshots_tab.html
+++ b/instances/templates/instances/snapshots_tab.html
@@ -107,7 +107,7 @@
                                             {% csrf_token %}{% submission_key %}
                                             <input type="hidden" name="name" value="{{ snap.name }}">
                                             {% if instance.status == 5 %}
-                                                <button type="submit" class="btn btn-sm btn-primary" name="revert_snapshot" title="{% trans 'Revert to this Snapshot' %}" onclick="return confirm('{% trans "Are you sure?" %}')" {% if busy or held %}disabled{% endif %}>
+                                                <button type="submit" class="btn btn-sm btn-primary" name="revert_snapshot" title="{% trans 'Revert to this Snapshot' %}" data-confirm="{% blocktrans with name=snap.name %}Revert to snapshot {{ name }}? Disk changes made since it are lost.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)" {% if busy or held %}disabled{% endif %}>
                                                         <span>{% bs_icon 'download' %} </span>
                                                 </button>
                                             {% else %}
@@ -121,7 +121,7 @@
                                     <td style="width:30px;">
                                         <form action="{% url 'instances:delete_snapshot' instance.id %}" method="post" role="form" aria-label="Delete snapshot form">{% csrf_token %}
                                             <input type="hidden" name="name" value="{{ snap.name }}">
-                                            <button type="submit" class="btn btn-sm btn-danger" title="{% trans 'Delete Snapshot' %}" onclick="return confirm('{% trans "Are you sure?" %}')" {% if busy or held %}disabled{% endif %}>
+                                            <button type="submit" class="btn btn-sm btn-danger" title="{% trans 'Delete Snapshot' %}" data-confirm="{% blocktrans with name=snap.name %}Delete snapshot {{ name }}? The VM's current disks are not changed.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)" {% if busy or held %}disabled{% endif %}>
                                                 {% bs_icon 'trash' %}
                                             </button>
                                         </form>
diff --git a/instances/views.py b/instances/views.py
index e4ed2119..b5be7e12 100755
--- a/instances/views.py
+++ b/instances/views.py
@@ -1685,10 +1685,7 @@ def set_qos(request, pk):
     else:
         messages.success(
             request,
-            _(
-                "%(qos_dir)s QoS is set. Network XML is changed. \
-                Stop and start network to activate new config."
-            )
+            _("%(qos_dir)s QoS is set. A running VM gets it after it is powered off and on.")
             % {"qos_dir": qos_dir.capitalize()},
         )
 
@@ -1714,10 +1711,7 @@ def unset_qos(request, pk):
     else:
         messages.success(
             request,
-            _(
-                "%(qos_dir)s QoS is deleted. Network XML is changed. \
-                Stop and start network to activate new config."
-            )
+            _("%(qos_dir)s QoS is deleted. A running VM keeps the old limit until it is powered off and on.")
             % {"qos_dir": qos_dir.capitalize()},
         )
     return _back(request, pk, "network")
diff --git a/interfaces/templates/interface.html b/interfaces/templates/interface.html
index 8ae23f8d..21ff5f29 100644
--- a/interfaces/templates/interface.html
+++ b/interfaces/templates/interface.html
@@ -63,9 +63,9 @@
                     <form action="" method="post" role="form" aria-label="Interface start/stop/delete form">{% csrf_token %}
                         {% if state == 0 %}
                             <input type="submit" class="btn btn-sm btn-primary" name="start" value="{% trans "Start" %}">
-                            <input type="submit" class="btn btn-sm btn-danger" name="delete" value="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                            <input type="submit" class="btn btn-sm btn-danger" name="delete" value="{% trans "Delete" %}" data-confirm="{% blocktrans with name=iface %}Delete interface {{ name }}? Its definition is removed from the host.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                         {% else %}
-                            <input type="submit" class="btn btn-sm btn-secondary" name="stop" value="{% trans "Stop" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                            <input type="submit" class="btn btn-sm btn-secondary" name="stop" value="{% trans "Stop" %}" data-confirm="{% blocktrans with name=iface %}Stop interface {{ name }}? The host and its VMs lose their connections through it at once; if you reach the host through it, you lose the host.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                         {% endif %}
                     </form>
                     {% endif %}
diff --git a/networks/templates/network.html b/networks/templates/network.html
index 2d093ebf..b608d4bd 100644
--- a/networks/templates/network.html
+++ b/networks/templates/network.html
@@ -49,9 +49,9 @@
                     <form action="" method="post" role="form" aria-label="Network start/stop/delete form">{% csrf_token %}
                         {% if state == 0 %}
                             <input type="submit" class="btn btn-sm btn-success" name="start" value="{% trans "Start" %}">
-                            <input type="submit" class="btn btn-sm btn-danger" name="delete" value="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                            <input type="submit" class="btn btn-sm btn-danger" name="delete" value="{% trans "Delete" %}" data-confirm="{% blocktrans with name=pool %}Delete network {{ name }}? VMs that use it no longer start.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                         {% else %}
-                            <input type="submit" class="btn btn-sm btn-secondary" name="stop" value="{% trans "Stop" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                            <input type="submit" class="btn btn-sm btn-secondary" name="stop" value="{% trans "Stop" %}" data-confirm="{% blocktrans with name=pool %}Stop network {{ name }}? Running VMs on it lose their connection through it at once.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                         {% endif %}
                     </form>
                 </dd>
@@ -61,7 +61,7 @@
                         {% if autostart == 0 %}
                             <input type="submit" class="btn btn-sm btn-success" name="set_autostart" value="{% trans "Enable" %}">
                         {% else %}
-                            <input type="submit" class="btn btn-sm btn-secondary" name="unset_autostart" onclick="return confirm('{% trans "Are you sure?" %}')" value="{% trans "Disable" %}">
+                            <input type="submit" class="btn btn-sm btn-secondary" name="unset_autostart" data-confirm="{% blocktrans with name=pool %}Disable autostart of network {{ name }}? After the host restarts it stays stopped, and VMs that use it do not start.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)" value="{% trans "Disable" %}">
                         {% endif %}
                     </form>
                 </dd>
@@ -136,7 +136,7 @@
                                value="Apply"
                                name="modify_dhcp_range"
                                title="{% trans "Edit DHCP Range" %}"
-                               onclick="return confirm('{% trans "Are you sure?" %}')"/>
+/>
                     </dd>
                     <input hidden name="family" value="ipv4"/>
                 </form>
@@ -190,12 +190,12 @@
                                     <input hidden name="family" value="ipv4"/>
                                     <button type="submit" class="btn btn-sm btn-primary"
                                             name="modify_fixed_address"
-                                            title="{% trans "Edit entry" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                            title="{% trans "Edit entry" %}">
                                             {% bs_icon 'save' %}
                                     </button>
                                     <button type="submit" class="btn btn-sm btn-danger"
                                             name="delete_fixed_address"
-                                            title="{% trans "Delete entry" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                            title="{% trans "Delete entry" %}" data-confirm="{% blocktrans with mac=fix4.mac %}Delete the fixed address of {{ mac }}? The VM may get another address when its lease ends.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                             {% bs_icon 'trash' %}
                                     </button>
                                 </td>
@@ -251,7 +251,7 @@
                             value="Apply"
                             name="modify_dhcp_range"
                             title="{% trans "Edit DHCP Range" %}" 
-                            onclick="return confirm('{% trans "Are you sure?" %}')"/>
+/>
                     </dd>
                     <input hidden name="family" value="ipv6"/>
                 </form>
@@ -301,12 +301,12 @@
                                         <input hidden name="family" value="ipv6"/>
                                         <button type="submit" class="btn btn-sm btn-primary"
                                                 name="modify_fixed_address"
-                                                title="{% trans "Edit entry" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                                title="{% trans "Edit entry" %}">
                                             <span>{% bs_icon 'save' %} </span>
                                         </button>
                                         <button type="submit" class="btn btn-sm btn-danger"
                                                 name="delete_fixed_address"
-                                                title="{% trans "Delete entry" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                                title="{% trans "Delete entry" %}" data-confirm="{% blocktrans with id=fix6.id %}Delete the fixed address of {{ id }}? The VM may get another address when its lease ends.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                             <span>{% bs_icon 'trash' %} </span>
                                         </button>
                                     </td>
@@ -358,12 +358,12 @@
                                 <input name="qos_direction" value="{{ q }}" hidden/>
                                 <button type="submit" class="btn btn-sm btn-primary"
                                         name="set_qos" data-bs-toggle="modal"
-                                        title="{% trans "Edit QoS" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                        title="{% trans "Edit QoS" %}">
                                         {% bs_icon 'save' %}
                                 </button>
                                 <button type="submit" class="btn btn-sm btn-danger"
                                         name="unset_qos"
-                                        title="{% trans "Delete QoS" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                        title="{% trans "Delete QoS" %}" data-confirm="{% blocktrans with direction=q name=pool %}Remove the {{ direction }} limit of network {{ name }}? It stays in force until the network is stopped and started.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                         {% bs_icon 'trash' %}
                                 </button>
                             </td>
diff --git a/nwfilters/templates/nwfilter.html b/nwfilters/templates/nwfilter.html
index e073a96b..aeb29594 100644
--- a/nwfilters/templates/nwfilter.html
+++ b/nwfilters/templates/nwfilter.html
@@ -104,7 +104,7 @@
                             <td style="width:30px;">
                                 <form action="" method="post" role="form" aria-label="Delete NWFilter form">{% csrf_token %}
                                     <input type="hidden" name="ref" value="{{ ref }}">
-                                    <button type="submit" class="btn btn-sm btn-danger" name="del_nwfilter_ref" title="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure?" %}');">
+                                    <button type="submit" class="btn btn-sm btn-danger" name="del_nwfilter_ref" title="{% trans "Delete" %}" data-confirm="{% blocktrans with ref=ref %}Remove the reference to {{ ref }}? Its rules no longer apply through this filter.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                         {% bs_icon 'trash' %}
                                     </button>
                                 </form>
@@ -148,7 +148,7 @@
                                 <input type="hidden" name="action" value="{{ rule.action }}">
                                 <input type="hidden" name="direction" value="{{ rule.direction }}">
                                 <input type="hidden" name="priority" value="{{ rule.priority }}">
-                                <button type="submit" class="btn btn-sm btn-danger" name="del_nwfilter_rule" title="{% trans 'Delete' %}" onclick="return confirm('{% trans "Are you sure?" %}');">
+                                <button type="submit" class="btn btn-sm btn-danger" name="del_nwfilter_rule" title="{% trans 'Delete' %}" data-confirm="{% trans "Delete this rule? Interfaces that use the filter no longer get it." %}" onclick="return confirm(this.dataset.confirm)">
                                     {% bs_icon 'trash' %} 
                                 </button>
                             </form>
diff --git a/nwfilters/templates/nwfilters.html b/nwfilters/templates/nwfilters.html
index 7f3e08a1..9e56c140 100644
--- a/nwfilters/templates/nwfilters.html
+++ b/nwfilters/templates/nwfilters.html
@@ -116,7 +116,7 @@
                         <td>
                             <form action="" method="post" role="form" aria-label="Delete NWFilter form">{% csrf_token %}
                                 <input type="hidden" name="nwfiltername" value="{{ nwfilter.name }}">
-                                <button type="submit" class="btn btn-sm btn-secondary" name="del_nwfilter" title="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                <button type="submit" class="btn btn-sm btn-secondary" name="del_nwfilter" title="{% trans "Delete" %}" data-confirm="{% blocktrans with name=nwfilter.name %}Delete filter {{ name }}? A filter a VM uses is not deleted.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                     {% bs_icon 'trash' %} 
                                 </button>
                             </form>
diff --git a/storages/templates/storage.html b/storages/templates/storage.html
index 214eaace..65dc4ee6 100644
--- a/storages/templates/storage.html
+++ b/storages/templates/storage.html
@@ -59,24 +59,27 @@
                 <dd class="col-6">{{ used|filesizeformat }}</dd>
                 <dt class="col-6">{% trans "State" %}</dt>
                 <dd class="col-6">
-                    <form action="" method="post" role="form" aria-label="Storage start/stop form" class="confirm-form">{% csrf_token %}
+                    <form action="" method="post" role="form" aria-label="Storage start/stop form">{% csrf_token %}
                         {% if state == 0 %}
                             <input type="submit" class="btn btn-sm btn-secondary" name="start" value="{% trans "Start" %}">
-                            <input type="submit" class="btn btn-sm btn-danger" name="delete" value="{% trans "Delete" %}">
+                            <input type="submit" class="btn btn-sm btn-danger" name="delete" value="{% trans "Delete" %}"
+                                   data-confirm="{% blocktrans with name=pool %}Delete pool {{ name }}? Only its definition goes; its volumes and their files stay.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                         {% else %}
-                            <input type="submit" class="btn btn-sm btn-secondary" name="stop" value="{% trans "Stop" %}">
+                            <input type="submit" class="btn btn-sm btn-secondary" name="stop" value="{% trans "Stop" %}"
+                                   data-confirm="{% blocktrans with name=pool %}Stop pool {{ name }}? Its files stay, but until it is started again its volumes cannot be managed and VMs with disks in it may not start.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                         {% endif %}
                     </form>
                 </dd>
                 <dt class="col-6">{% trans "Autostart" %}</dt>
                 <dd class="col-6">
-                    <form action="" method="post" role="form" aria-label="Storage disable/enable autostart form" class="confirm-form">{% csrf_token %}
+                    <form action="" method="post" role="form" aria-label="Storage disable/enable autostart form">{% csrf_token %}
                     {% if autostart == 0 %}
                         <input type="submit" class="btn btn-sm btn-secondary" name="set_autostart"
                                 value="{% trans "Enable" %}">
                         {% else %}
                         <input type="submit" class="btn btn-sm btn-secondary" name="unset_autostart"
-                                value="{% trans "Disable" %}">
+                                value="{% trans "Disable" %}"
+                                data-confirm="{% blocktrans with name=pool %}Disable autostart of pool {{ name }}? After the host restarts it stays stopped.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                     {% endif %}
                 </form>
                 </dd>
@@ -172,9 +175,10 @@
                             {% endif %}
                         </td>
                         <td>
-                            <form action="" method="post" role="form" aria-label="Delete volume form" class="confirm-form">{% csrf_token %}
+                            <form action="" method="post" role="form" aria-label="Delete volume form">{% csrf_token %}
                                 <input type="hidden" name="volname" value="{{ volume.name }}">
-                                <button type="submit" class="btn btn-sm btn-secondary" name="del_volume" title="{% trans "Delete" %}">
+                                <button type="submit" class="btn btn-sm btn-secondary" name="del_volume" title="{% trans "Delete" %}"
+                                        data-confirm="{% blocktrans with name=volume.name %}Delete volume {{ name }}? Its file and data are removed; a volume a VM uses is not deleted.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                     {% bs_icon 'trash' %}
                                 </button>
                             </form>
@@ -221,12 +225,6 @@
         });
 
         $(document).ready(function() {
-            $('.confirm-form').on('submit', function(e) {
-                if (!confirm('{% trans "Are you sure?"|escapejs %}')) {
-                    e.preventDefault();
-                }
-            });
-
             var pendingUpload = null;
             var uploadInProgress = false;
             // the browser sends the file: leaving the page stops the upload
diff --git a/virtsecrets/templates/secrets.html b/virtsecrets/templates/secrets.html
index 40d235e4..3648c5ad 100644
--- a/virtsecrets/templates/secrets.html
+++ b/virtsecrets/templates/secrets.html
@@ -76,7 +76,7 @@
                                         <a data-bs-toggle="modal" href="#editSecret{{ secret.uuid }}" class="btn btn-sm btn-primary" title="{% trans "Edit" %}">
                                             <span>{% bs_icon 'pencil' %} </span>
                                         </a>
-                                        <button type="submit" class="btn btn-sm btn-danger" name="delete" title="{% trans "Delete" %}" onclick="return confirm('{% trans "Are you sure?" %}')">
+                                        <button type="submit" class="btn btn-sm btn-danger" name="delete" title="{% trans "Delete" %}" data-confirm="{% blocktrans with uuid=secret.uuid %}Delete secret {{ uuid }}? Its value is gone; disks and pools that need it no longer start.{% endblocktrans %}" onclick="return confirm(this.dataset.confirm)">
                                             <span>{% bs_icon 'trash' %} </span>
                                         </button>
                                     </form>
diff --git a/webvirtcloud/tests/test_confirm_prompts.py b/webvirtcloud/tests/test_confirm_prompts.py
new file mode 100644
index 00000000..7595488a
--- /dev/null
+++ b/webvirtcloud/tests/test_confirm_prompts.py
@@ -0,0 +1,29 @@
+"""A confirmation says what its action does: every prompt in a template is the
+button's own data-confirm text, shown by return confirm(this.dataset.confirm)."""
+
+from pathlib import Path
+
+from django.conf import settings
+from django.test import SimpleTestCase
+
+ONCLICK = 'onclick="return confirm(this.dataset.confirm)"'
+
+
+class ConfirmPromptTests(SimpleTestCase):
+    def test_every_prompt_is_the_buttons_own_text(self):
+        base = Path(settings.BASE_DIR)
+        templates = [*base.glob("*/templates/**/*.html"), *base.glob("templates/**/*.html")]
+        self.assertTrue(templates)
+        for path in templates:
+            text = path.read_text()
+            at = text.find("confirm(")
+            while at != -1:
+                # the tag around it: prompt texts and template tags hold no < or >
+                tag = text[text.rfind("<", 0, at):text.find(">", at) + 1]
+                with self.subTest(template=str(path.relative_to(base)), tag=tag[:60]):
+                    self.assertRegex(tag, r"^<(button|input|a)\b")
+                    self.assertIn(ONCLICK, tag)
+                    self.assertIn('data-confirm="', tag)
+                    self.assertNotIn('data-confirm=""', tag)
+                    self.assertNotIn("Are you sure", tag)
+                at = text.find("confirm(", at + 1)