diff --git a/internal/handlers/source_detail_test.go b/internal/handlers/source_detail_test.go
index 007f464..2d58837 100644
--- a/internal/handlers/source_detail_test.go
+++ b/internal/handlers/source_detail_test.go
@@ -275,3 +275,99 @@ func TestHandleSourceDetail_FitsWideAndNarrowWindows(t *testing.T) {
 		`<div class="flex flex-wrap justify-between items-center gap-2 mt-2">`,
 	)
 }
+
+// TestHandleSourceDetail_DeletePromptsNameWhatIsLost checks that each
+// delete prompt on the webhook page names the webhook, entrypoint or
+// target and says what deleting it loses, that the webhook's gives its
+// number of stored events (5 received, 2 removed by retention, so 3,
+// the statistics pane's "Within retention" figure), and that an
+// entrypoint with no description is named by its URL. The template
+// writes the slashes after http: as \/, which the browser reads as /.
+func TestHandleSourceDetail_DeletePromptsNameWhatIsLost(t *testing.T) {
+	t.Parallel()
+
+	var (
+		h     *handlers.Handlers
+		sess  *session.Session
+		db    *database.Database
+		dbMgr *database.WebhookDBManager
+	)
+
+	app := newTestApp(t, &h, &sess, &db, &dbMgr)
+	app.RequireStart()
+
+	t.Cleanup(app.RequireStop)
+
+	wh := seedWebhook(t, db)
+
+	webhookDB, err := dbMgr.GetDB(wh.ID)
+	require.NoError(t, err)
+	require.NoError(t, database.AddEventTotals(
+		webhookDB, database.EventTotals{Events: 5, EventsRemoved: 2},
+	))
+
+	unnamed := seedEntrypoint(t, db, wh.ID)
+	require.NoError(t, db.DB().Omit(clause.Associations).Create(
+		&database.Entrypoint{
+			WebhookID:   wh.ID,
+			Path:        "described-" + wh.ID,
+			Description: "Stripe",
+			Active:      true,
+		},
+	).Error)
+	seedTarget(t, db, wh.ID, database.TargetTypeLog)
+
+	body := renderSourceDetailPage(t, h, sess, wh.ID)
+
+	assert.Contains(t, body,
+		`Delete webhook &quot;delete-me&quot;?\n\n`+
+			`This deletes its stored events (3) and their deliveries. `+
+			`Any archive files it wrote are kept.`)
+	assert.Contains(t, body,
+		`Delete entrypoint &quot;Stripe&quot;?\n\n`+
+			`Senders using its URL get an error from now on, `+
+			`and the URL cannot be restored.`)
+	assert.Contains(t, body,
+		`Delete entrypoint &quot;http:\/\/example.com/h/`+
+			unnamed.Path+`&quot;?`)
+	assert.Contains(t, body,
+		`Delete target &quot;t-log&quot;?\n\n`+
+			`Nothing more is delivered to it. `+
+			`Its past deliveries stay in the event log.`)
+}
+
+// TestHandleSourceDetail_DeletePromptKeepsQuotesInName checks that a
+// webhook name with quotes, a backslash, a closing script tag and a
+// newline reaches its delete prompt escaped for the script, which the
+// browser reads back as the name typed: each quote and angle bracket
+// as a \u escape, the slash as \/, the newline as \n and the backslash
+// doubled. An unescaped newline would break the prompt's script, and
+// the form would then submit without asking.
+func TestHandleSourceDetail_DeletePromptKeepsQuotesInName(t *testing.T) {
+	t.Parallel()
+
+	var (
+		h    *handlers.Handlers
+		sess *session.Session
+		db   *database.Database
+	)
+
+	app := newTestApp(t, &h, &sess, &db)
+	app.RequireStart()
+
+	t.Cleanup(app.RequireStop)
+
+	wh := &database.Webhook{
+		UserID: deleteTestUserID,
+		Name:   "Bob's \"best\" \\ hook</script>\nline two",
+	}
+	require.NoError(
+		t, db.DB().Omit(clause.Associations).Create(wh).Error,
+	)
+
+	body := renderSourceDetailPage(t, h, sess, wh.ID)
+
+	assert.Contains(t, body,
+		"Delete webhook &quot;Bob\\u0027s \\u0022best\\u0022 \\\\ hook"+
+			"\\u003c\\/script\\u003e\\nline two&quot;?")
+}
diff --git a/internal/handlers/source_management.go b/internal/handlers/source_management.go
index 01dcb50..5b6049c 100644
--- a/internal/handlers/source_management.go
+++ b/internal/handlers/source_management.go
@@ -612,8 +612,9 @@ func (h *Handlers) renderSourceDetail(
 
 	// The host is the client's Host header, unvalidated. It is
 	// inert only because source_detail.html renders BaseURL as
-	// text inside a <code> element; putting it in an href or any
-	// other URL context needs it constrained first.
+	// text, inside a <code> element and in an entrypoint's delete
+	// prompt; putting it in an href or any other URL context
+	// needs it constrained first.
 	baseURL := scheme + "://" + r.Host
 
 	// The template calls Webhook methods, which take pointer
diff --git a/templates/source_detail.html b/templates/source_detail.html
index a27c382..eeea81a 100644
--- a/templates/source_detail.html
+++ b/templates/source_detail.html
@@ -20,7 +20,11 @@
             <div class="flex gap-2">
                 <a href="/hook/{{.Webhook.ID}}/events" class="btn-secondary">Full Event Log</a>
                 <a href="/hook/{{.Webhook.ID}}/edit" class="btn-secondary">Edit</a>
-                <form method="POST" action="/hook/{{.Webhook.ID}}/delete" onsubmit="return confirm('Delete this webhook and all its data?')">
+                <!-- The delete prompts are the browser's own, so they
+                     work without the page's scripts. The template
+                     escapes each name for the script, so a quote or a
+                     backslash in it shows as typed. -->
+                <form method="POST" action="/hook/{{.Webhook.ID}}/delete" onsubmit="return confirm('Delete webhook &quot;{{.Webhook.Name}}&quot;?\n\nThis deletes its stored events{{with .Stats}} ({{.WithinRetention.Events}}){{end}} and their deliveries. Any archive files it wrote are kept.')">
                     <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
                     <button type="submit" class="btn-danger">Delete</button>
                 </form>
@@ -83,7 +87,7 @@
                                     {{if .Active}}Deactivate{{else}}Activate{{end}}
                                 </button>
                             </form>
-                            <form method="POST" action="/hook/{{$.Webhook.ID}}/entrypoints/{{.ID}}/delete" onsubmit="return confirm('Delete this entrypoint?')" class="inline">
+                            <form method="POST" action="/hook/{{$.Webhook.ID}}/entrypoints/{{.ID}}/delete" onsubmit="return confirm('Delete entrypoint &quot;{{if .Description}}{{.Description}}{{else}}{{$.BaseURL}}/h/{{.Path}}{{end}}&quot;?\n\nSenders using its URL get an error from now on, and the URL cannot be restored.')" class="inline">
                                 <input type="hidden" name="csrf_token" value="{{$.CSRFToken}}">
                                 <button type="submit" class="btn-small text-red-600" title="Delete">Delete</button>
                             </form>
@@ -249,7 +253,7 @@
                                     {{if .Active}}Deactivate{{else}}Activate{{end}}
                                 </button>
                             </form>
-                            <form method="POST" action="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/delete" onsubmit="return confirm('Delete this target?')" class="inline">
+                            <form method="POST" action="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/delete" onsubmit="return confirm('Delete target &quot;{{.Name}}&quot;?\n\nNothing more is delivered to it. Its past deliveries stay in the event log.')" class="inline">
                                 <input type="hidden" name="csrf_token" value="{{$.CSRFToken}}">
                                 <button type="submit" class="btn-small text-red-600" title="Delete">Delete</button>
                             </form>