introduce ui.add_head_html()

nicegui/elements/page.py

@@ -88,3 +88,7 @@ class Page(jp.QuasarPage):
     def handle_javascript_result(self, msg) -> bool:
         self.waiting_javascript_commands[msg.request_id] = msg.result
         return False
+
+
+def add_head_html(self, html: str) -> None:
+    page_stack[-1].head_html += html

nicegui/ui.py

@@ -33,7 +33,7 @@ class Ui:
     from .elements.notify import Notify as notify
     from .elements.number import Number as number
     from .elements.open import open, open_async
-    from .elements.page import Page as page
+    from .elements.page import Page as page, add_head_html
     from .elements.radio import Radio as radio
     from .elements.row import Row as row
     from .elements.select import Select as select