Miiverse Custom Drawing Uploader Bookmarklet (for 3DS-US)

javascript:$(".add-post-page-content").before("<input type=\"file\" style=\"font-size:16px\" onchange=\"var file = document.querySelector('input[type=file]').files[0]; var reader = new FileReader(); reader.addEventListener('load', function () { document.querySelectorAll('.textarea-memo-preview')[0].style = &quot;background-image: url('&quot;+reader.result+&quot;');&quot;; document.querySelectorAll('input[name=&quot;painting&quot;]')[0].value=reader.result.split('base64,')[1] }, false); if (file) { reader.readAsDataURL(file); }\">");