import 'dart:html';
void main()
{
var element = querySelector("body");
var childs = element.children;
for(var child in childs)
{
var attributes_child = child.attributes;
if(attributes_child['name'] == 'container')
{
child.text = "Hi";
child.style.backgroundColor = "white";
}
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Awesome page</title>
</head>
<body>
<div name="container">
</div>
</body>
</html>