Don't use unsupported download attribute with preferred filename

maps.py

@@ -831,16 +831,14 @@ def html_hashtag_maps(base_dir: str, tag_name: str,
         period_str2 = period_str.replace('Last ', '').lower()
         endpoint_str = \
             '/tagmaps/' + tag_name + '-' + period_str2.replace(' ', '_')
-        download_filename = \
-            (tag_name + '-' +
-             period_str.lower()).replace(' ', '_') + '.' + map_format
         if html_str:
             html_str += ' '
         description = period_str
         if translate.get(period_str):
             description = translate[period_str]
-        html_str += '<a href="' + endpoint_str + \
-            '" download="' + download_filename + '">' + \
+        # NOTE: don't use download="preferredfilename" which is
+        # unsupported by some browsers
+        html_str += '<a href="' + endpoint_str + '" download>' + \
             description + '</a>'
     if html_str:
         html_str = '📌 ' + html_str

webapp_calendar.py

@@ -336,9 +336,11 @@ def _html_calendar_day(person_cache: {}, translate: {},
     calendar_str += '</table>\n</main>\n'
 
     # icalendar download link
+    # NOTE: don't use download="preferredfilename" which is
+    # unsupported by some browsers
     calendar_str += \
         '    <a href="' + path + '?ical=true" ' + \
-        'download="icalendar.ics" class="imageAnchor" tabindex="3">' + \
+        'download class="imageAnchor" tabindex="3">' + \
         '<img class="ical" src="/icons/ical.png" ' + \
         'title="iCalendar" alt="iCalendar" /></a>\n'
 
@@ -657,9 +659,11 @@ def html_calendar(person_cache: {}, translate: {},
         translate['Add to the calendar'] + '</a></p>\n<p>' + \
         show_reminders_link + '</p>\n</center>\n'
 
+    # NOTE: don't use download="preferredfilename" which is
+    # unsupported by some browsers
     calendar_icon_str = \
         '    <a href="' + path + '?ical=true" ' + \
-        'download="icalendar.ics" class="imageAnchor" tabindex="3">' + \
+        'download class="imageAnchor" tabindex="3">' + \
         '<img class="ical" src="/icons/ical.png" ' + \
         'title="iCalendar" alt="iCalendar" /></a>\n'
 

webapp_profile.py

@@ -783,10 +783,11 @@ def _get_profile_header(base_dir: str, http_prefix: str, nickname: str,
                                        translate)
 
     # show vcard download link
+    # NOTE: don't use download="preferredfilename" which is
+    # unsupported by some browsers
     html_str += \
         '    <a href="/users/' + nickname + '.vcf" ' + \
-        'type="text/vcard" ' + \
-        'tabindex="1" class="imageAnchor">' + \
+        'type="text/vcard" tabindex="1" class="imageAnchor">' + \
         '<img class="vcard" src="/icons/vcard.png" ' + \
         'title="vCard" alt="vCard" /></a>\n'
 
@@ -2842,9 +2843,11 @@ def _html_edit_profile_import_export(nickname: str, domain: str,
         '<p><a href="/users/' + nickname + \
         '/followingaccounts"><label class="labels">' + \
         translate['Following'] + '</label></a>'
+    # NOTE: don't use download="preferredfilename" which is
+    # unsupported by some browsers
     edit_profile_form += \
         ' <a href="/users/' + nickname + '/followingaccounts.csv" ' + \
-        'download="' + nickname + '@' + domain + '_following.csv">' + \
+        'download>' + \
         '<label class="labels">⇩ CSV</label></a></p><br>\n'
     followers_str = translate['Followers']
     if premium: