Remove top-level references to window and document

src/pyj/book_list/book_details.pyj

@@ -143,7 +143,8 @@ def add_stars_to(stars, val, allow_half_stars):
         stars.appendChild(svgicon('star-half'))
 
 
-window.addEventListener('resize', debounce(adjust_all_iframes, 250))
+if window?:
+    window.addEventListener('resize', debounce(adjust_all_iframes, 250))
 
 def adjusting_sandboxed_html(html, extra_css):
     color = get_color_as_rgba('window-foreground')

src/pyj/read_book/flow_mode.pyj

@@ -244,6 +244,7 @@ def handle_shortcut(sc_name, evt):
 
 
 def layout(is_single_page):
+    add_visibility_listener()
     line_height(True)
     rem_size(True)
     set_css(document.body, margin='0', border_width='0', padding='0')
@@ -258,13 +259,17 @@ def auto_scroll_resume():
     scroll_animator.sync()
 
 
-# Pause auto-scroll while minimized
-document.addEventListener("visibilitychange", def():
-    if (document.visibilityState is 'visible'):
-        scroll_animator.sync()
-    else:
-        scroll_animator.pause()
-)
+def add_visibility_listener():
+    if add_visibility_listener.done:
+        return
+    add_visibility_listener.done = True
+    # Pause auto-scroll while minimized
+    document.addEventListener("visibilitychange", def():
+        if (document.visibilityState is 'visible'):
+            scroll_animator.sync()
+        else:
+            scroll_animator.pause()
+    )
 
 
 def cancel_scroll():

src/pyj/read_book/prefs/head_foot.pyj

@@ -146,7 +146,7 @@ def commit_head_foot(onchange, container):
         onchange()
 
 
-if window.Intl?.DateTimeFormat:
+if window?.Intl?.DateTimeFormat:
     time_formatter = window.Intl.DateTimeFormat(undefined, {'hour':'numeric', 'minute':'numeric'})
 else:
     time_formatter = {'format': def(date):

src/pyj/read_book/tts.pyj

@@ -20,7 +20,6 @@ def escaper():
     return def(text):
         el.nodeValue = text
         return ser.serializeToString(el)
-escape_for_xml = escaper()
 
 
 class Client:
@@ -29,6 +28,7 @@ class Client:
     max_rate = 2
 
     def __init__(self):
+        self.escape_for_xml = escaper()
         self.stop_requested_at = None
         self.status = {'synthesizing': False, 'paused': False}
         self.queue = v'[]'
@@ -134,7 +134,7 @@ class Client:
                 # buf.push('<mark name="' + x + '"/>')
                 buf.push('')
             else:
-                buf.push(escape_for_xml(x))
+                buf.push(self.escape_for_xml(x))
             size += buf[-1].length
             if size > 24000:
                 buf = v'[]'

src/pyj/select.pyj

@@ -3,7 +3,7 @@
 from __python__ import bound_methods, hash_literals
 
 
-if document.caretPositionFromPoint:
+if document?.caretPositionFromPoint:
     caret_position_from_point = document.caretPositionFromPoint.bind(document)
 else:
     caret_position_from_point = def(x, y):

src/pyj/utils.pyj

@@ -8,7 +8,7 @@ from book_list.theme import get_font_family
 
 
 is_ios = v'!!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)'
-if !is_ios and window.navigator.platform is 'MacIntel' and window.navigator.maxTouchPoints > 1:
+if !is_ios and v'!!navigator.platform' and window? and window.navigator.platform is 'MacIntel' and window.navigator.maxTouchPoints > 1:
     # iPad Safari in desktop mode https://stackoverflow.com/questions/57765958/how-to-detect-ipad-and-ipad-os-version-in-ios-13-and-up
     is_ios = True