JS如何清除style中的内容

网站的网页加上了CSS3的防复制user-select代码，且附带有水印。想用查看源文件的方式复制文字，但是有水印的阻挡，会将部分代码连同一起复制了。每次为了删除<style>都要专门开控制台，甚是麻烦。想问问能不能用JavaScript去掉这种复制的限制，最好是将<style>的水印和复制限制一同去掉
<div id="content">
                    <div class="skin-y1">
                        <style>
                            .skin-y1{
                                overflow: hidden;
                                position: relative;
                                -webkit-user-select: none;
                                -moz-user-select: none;
                                -ms-user-select: none;
                                user-select: none;
                            }
 
                            .skin-y1:before {
                                background-image: url(***);
                                content: " ";
                                width: 200%;
                                height: 200%;
                                position: absolute;
                                left: -100%;
                                top: -100%;
                                color: #E4E4E4;
                                z-index: -9999;
                            }
                        </style>
document.body.contentEditable='true';document.designMode='on'; void 0

在浏览器书签栏用下面代码做为地址创建个书签
javascript:void(function(){var sty=document.getElementsByTagName("style")[0];sty.parentNode.removeChild(sty);}());