页面历史记录

<div>
	<object id="dynamic-svg" data="/mainpage.svg" type="image/svg+xml" style="width:100% !important;"></object>
    <script>
        var svgHolder = document.querySelector("object#dynamic-svg");
        svgHolder.onload = function() {
            var svgDocument = svgHolder.contentDocument;
            var style = svgDocument.createElementNS("http://www.w3.org/2000/svg", "style");
    
            style.textContent = '@import url("/hover.css");';
    
            var svgElem = svgDocument.querySelector('svg');
            svgElem.insertBefore(style, svgElem.firstChild);  
        };
    </script>
</div>