pmdartus/test.html

## test.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <div id="container"></div>

    <script>
        const styleParent = document.body.querySelector('#container');
        const resetCSS = `a,abbr,acronym,address,applet,article,aside,audio,b,big,blockquote,body,canvas,caption,center,cite,code,dd,del,details,dfn,div,dl,dt,em,embed,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,html,i,iframe,img,ins,kbd,label,legend,li,mark,menu,nav,object,ol,output,p,pre,q,ruby,s,samp,section,small,span,strike,strong,sub,summary,sup,table,tbody,td,tfoot,th,thead,time,tr,tt,u,ul,var,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}:focus{outline:0}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:after,blockquote:before,q:after,q:before{content:'';content:none}table{border-collapse:collapse;border-spacing:0}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration,input[type=search]::-webkit-search-results-button,input[type=search]::-webkit-search-results-decoration{-webkit-appearance:none;-moz-appearance:none}input[type=search]{-webkit-appearance:none;-moz-appearance:none;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box}textarea{overflow:auto;vertical-align:top;resize:vertical}audio,canvas,video{display:inline-block;max-width:100%}audio:not([controls]){display:none;height:0}[hidden]{display:none}html{font-size:100%;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}a:focus{outline:thin dotted}a:active,a:hover{outline:0}img{border:0;-ms-interpolation-mode:bicubic}figure{margin:0}form{margin:0}fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}legend{border:0;padding:0;white-space:normal}button,input,select,textarea{font-size:100%;margin:0;vertical-align:baseline}button,input{line-height:normal}button,select{text-transform:none}button,html input[type=button],input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}input[type=search]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration{-webkit-appearance:none}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}textarea{overflow:auto;vertical-align:top}table{border-collapse:collapse;border-spacing:0}button,html,input,select,textarea{color:#222}::-moz-selection{background:#b3d4fc;text-shadow:none}::selection{background:#b3d4fc;text-shadow:none}img{vertical-align:middle}fieldset{border:0;margin:0;padding:0}textarea{resize:vertical}.chromeframe{margin:.2em 0;background:#ccc;color:#000;padding:.2em 0}`;

        function resetContainer() {
            while (styleParent.firstChild) {
                styleParent.removeChild(styleParent.firstChild)
            }
        }

        function injectStylesheet(count) {
            for (let i = 0; i < count; i++) {
                const elm = document.createElement('style');
                elm.type = 'text/css';
                elm.textContent = resetCSS;

                styleParent.appendChild(elm);
            }
        }

        function cloneStylesheet(count) {
            const elm = document.createElement('style');
            elm.type = 'text/css';
            elm.textContent = resetCSS;

            for (let i = 0; i < count; i++) {
                const clone = elm.cloneNode(true);
                styleParent.appendChild(clone);
            }
        }

        injectStylesheet(100);
        cloneStylesheet(100);

        resetContainer();

        const t1 = performance.now();
        injectStylesheet(10000);
        const t1End = performance.now();
        console.log('Stylesheet injection', t1End - t1);

        resetContainer();

        const t2 = performance.now()
        cloneStylesheet(10000);
        const t2End = performance.now();
        console.log('Stylesheet clone', t2End - t2);

        resetContainer();
    </script>
</body>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	</head>
	<body>

	<div id="container"></div>

	<script>
	const styleParent = document.body.querySelector('#container');
	const resetCSS = `a,abbr,acronym,address,applet,article,aside,audio,b,big,blockquote,body,canvas,caption,center,cite,code,dd,del,details,dfn,div,dl,dt,em,embed,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,html,i,iframe,img,ins,kbd,label,legend,li,mark,menu,nav,object,ol,output,p,pre,q,ruby,s,samp,section,small,span,strike,strong,sub,summary,sup,table,tbody,td,tfoot,th,thead,time,tr,tt,u,ul,var,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}:focus{outline:0}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:after,blockquote:before,q:after,q:before{content:'';content:none}table{border-collapse:collapse;border-spacing:0}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration,input[type=search]::-webkit-search-results-button,input[type=search]::-webkit-search-results-decoration{-webkit-appearance:none;-moz-appearance:none}input[type=search]{-webkit-appearance:none;-moz-appearance:none;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box}textarea{overflow:auto;vertical-align:top;resize:vertical}audio,canvas,video{display:inline-block;max-width:100%}audio:not([controls]){display:none;height:0}[hidden]{display:none}html{font-size:100%;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}a:focus{outline:thin dotted}a:active,a:hover{outline:0}img{border:0;-ms-interpolation-mode:bicubic}figure{margin:0}form{margin:0}fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}legend{border:0;padding:0;white-space:normal}button,input,select,textarea{font-size:100%;margin:0;vertical-align:baseline}button,input{line-height:normal}button,select{text-transform:none}button,html input[type=button],input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}input[type=search]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration{-webkit-appearance:none}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}textarea{overflow:auto;vertical-align:top}table{border-collapse:collapse;border-spacing:0}button,html,input,select,textarea{color:#222}::-moz-selection{background:#b3d4fc;text-shadow:none}::selection{background:#b3d4fc;text-shadow:none}img{vertical-align:middle}fieldset{border:0;margin:0;padding:0}textarea{resize:vertical}.chromeframe{margin:.2em 0;background:#ccc;color:#000;padding:.2em 0}`;

	function resetContainer() {
	while (styleParent.firstChild) {
	styleParent.removeChild(styleParent.firstChild)
	}
	}

	function injectStylesheet(count) {
	for (let i = 0; i < count; i++) {
	const elm = document.createElement('style');
	elm.type = 'text/css';
	elm.textContent = resetCSS;

	styleParent.appendChild(elm);
	}
	}

	function cloneStylesheet(count) {
	const elm = document.createElement('style');
	elm.type = 'text/css';
	elm.textContent = resetCSS;

	for (let i = 0; i < count; i++) {
	const clone = elm.cloneNode(true);
	styleParent.appendChild(clone);
	}
	}

	injectStylesheet(100);
	cloneStylesheet(100);

	resetContainer();

	const t1 = performance.now();
	injectStylesheet(10000);
	const t1End = performance.now();
	console.log('Stylesheet injection', t1End - t1);

	resetContainer();

	const t2 = performance.now()
	cloneStylesheet(10000);
	const t2End = performance.now();
	console.log('Stylesheet clone', t2End - t2);

	resetContainer();
	</script>
	</body>
	</html>