test

        host.innerHTML = '';

        iframe = document.createElement('iframe');

        iframe.id = 'preview-iframe';

        // Name must be set BEFORE the iframe is inserted into the DOM so that

        // its named browsing context exists when a form targets it. Otherwise

        // form.submit() can't resolve the target and opens a new window.

        iframe.name = 'preview-iframe';

        iframe.setAttribute('name', 'preview-iframe');

        iframe.style.cssText = 'width:100%;height:100%;border:none;';

        host.appendChild(iframe);

        return iframe;

                var f = getIframe();

                f.removeAttribute('srcdoc');

                f.name = 'preview-iframe';

                f.setAttribute('name', 'preview-iframe');

                var form = document.createElement('form');

                form.method = 'POST';