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put this in google app scripts to call the html file
function doGet() {
return HtmlService.createTemplateFromFile('form.html')
.evaluate() // evaluate MUST come before setting the Sandbox mode
.setXFrameOptionsMode(HtmlService.XFrameOptionsMode.ALLOWALL);
}
------- OR ---------
return HtmlService.createTemplateFromFile('noticeBoard').evaluate()
.setSandboxMode(HtmlService.SandboxMode.IFRAME)
.setXFrameOptionsMode(HtmlService.XFrameOptionsMode.ALLOWALL);