$w('#html1').postMessage("<html>Hi!</html>"); shows nothing

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Seems still miss something. I change my on click code and html code as following:

export function button2_click(event, $w) {
let bodycode = $w(‘#textBox1’).value;
$w(‘#html1’).postMessage(bodycode);
console.log(bodycode);}

** The following HTML code I paste in #textBox1 , also tried paste in #text **

Hi!

When button click, console log shows the html code but #html1 stay still.