Note: This attribute is considered a legacy attribute and redefined as allow="payment". Allows the resource to open new windows that will not inherit the sandboxing. To illustrate how this isolation from the JavaScript and CSS is handy, lets take a look at these two situations: In an application, the user could create emails and save them as templates. frameborder There are many speculations around this subject. In this article. The default width and height of an iframe is 800x600 pixel. We're committed to your privacy. Yes , it worked that way . The