I recommend using HTML DOM Edit HTML content instead of a scriptlet. Here's the w3 reference so you can try to write it yourself, instead of just copying mine. Here is an example program:
code.gs
function doGet() {
return HtmlService.createTemplateFromFile('Index')
.evaluate();
}
function include(filename) {
var Email_user = Session.getActiveUser().getEmail();
var hrefmail = "mailto:"+Email_user ;
val_htm_mail_1 = hrefmail ;
return HtmlService.createHtmlOutputFromFile(filename)
.getContent();
}
Index.html
<!DOCTYPE html>
<html>
<head>
<base target="_top">
</head>
<body>
<span id="linkEmail">...</span><br/>
<script>
document.getElementById("linkEmail").innerHTML = this.val_htm_mail_1;
</script>
<?!= include ('javascript'); ?>
</body>
</html>
javascript.html
<script>
window.addEventListener('load', function() {
console.log('Page is loaded');
});
</script>
*Note you may need to adjust this depending on your browser settings
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