Hello @WAvdBeek ,

why do you want to append text directly by websocket? Although this could be possible, I suggest you to use the method proposed by @tuliomgui . It doesn't cost more in terms of efficiency.
However here is an example that fit your request:

import remi.gui as gui
from remi import start, App
import time


class MyApp(App):
    def main(self):
        # creating a container VBox type, vertical (you can use also HBox or Widget)
        main_container = gui.VBox(width=300, style={'margin': '0px auto'})

        bt_log = gui.Button("Append log")
        bt_log.onclick.do(self.on_btlog_click)
        main_container.append(bt_log)

        self.txt_log = gui.TextInput(single_line=False, width = "100%", height = 150)
        main_container.append(self.txt_log)

        # returning the root widget
        return main_container

    def on_btlog_click(self, emitter):
        log_message = str(time.time()) + " - a message example"

        self.execute_javascript(f"""element = document.getElementById("{self.txt_log.identifier}");
            element.textContent = "{log_message}" + "\\n" + element.textContent;""")


if __name__ == "__main__":
    start(MyApp, address='0.0.0.0', port=0, start_browser=True)

Uh oh!

automatic scroll down in text widget (write only) #515

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