JSFiddle - React, Tailwind, and code Playground

HTML

<pre class="line-numbers language-markup">
<code>
    <b:if cond=&#39;data:blog.url == &quot;http://domain.com/p/about.html&quot;&#39;>

            CSS HERE
        
    </b:if>
</code>
</pre>

CSS

code[class*="language-"],
pre[class*="language-"] {
	color: black;
	text-shadow: 0 1px white;
	font-family: Consolas, Monaco, 'Andale Mono', monospace;
	direction: ltr;
	text-align: left;
	white-space: pre;
	word-spacing: normal;

	-moz-tab-size: 4;
	-o-tab-size: 4;
	tab-size: 4;

	-webkit-hyphens: none;
	-moz-hyphens: none;
	-ms-hyphens: none;
	hyphens: none;
}

pre[class*="language-"]::-moz-selection, pre[class*="language-"] ::-moz-selection,
code[class*="language-"]::-moz-selection, code[class*="language-"] ::-moz-selection {
	text-shadow: none;
	background: #b3d4fc;
}

pre[class*="language-"]::selection, pre[class*="language-"] ::selection,
code[class*="language-"]::selection, code[class*="language-"] ::selection {
	text-shadow: none;
	background: #b3d4fc;
}

@media print {
	code[class*="language-"],
	pre[class*="language-"] {
		text-shadow: none;
	}
}

/* Code blocks */
pre[class*="language-"] {
	padding: 1em;
	margin: .5em 0;
	overflow: auto;
}

:not(pre) > code[class*="language-"],
pre[class*="language-"] {
	background: #f5f2f0;
}

/* Inline code */
:not(pre) > code[class*="language-"] {
	padding: .1em;
	border-radius: .3em;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
	color: slategray;
}

.token.punctuation {
	color: #999;
}

.namespace {
	opacity: .7;
}

.token.property,
.token.tag,
.token.boolean,
.token.number {
	color: #905;
}

.token.selector,
.token.attr-name,
.token.string {
	color: #690;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
	color: #a67f59;
	background: hsla(0,0%,100%,.5);
}

.token.atrule,
.token.attr-value,
.token.keyword {
	color: #07a;
}


.token.regex,
.token.important {
	color: #e90;
}

.token.important {
	font-weight: bold;
}

.token.entity {
	cursor: help;
}
pre.line-numbers {
	position: relative;
	padding-left: 3.8em;
	counter-reset: linenumber;
}

pre.line-numbers > code {
	position: relative;
}

.line-numbers .line-numbers-rows {
	position:...

JavaScript

/**
 * Prism: Lightweight, robust, elegant syntax highlighting
 * MIT license http://www.opensource.org/licenses/mit-license.php/
 * @author Lea Verou http://lea.verou.me
 */(function(){var e=/\blang(?:uage)?-(?!\*)(\w+)\b/i,t=self.Prism={util:{type:function(e){return Object.prototype.toString.call(e).match(/\[object (\w+)\]/)[1]},clone:function(e){var n=t.util.type(e);switch(n){case"Object":var r={};for(var i in e)e.hasOwnProperty(i)&&(r[i]=t.util.clone(e[i]));return r;case"Array":return e.slice()}return e}},languages:{extend:function(e,n){var r=t.util.clone(t.languages[e]);for(var i in n)r[i]=n[i];return r},insertBefore:function(e,n,r,i){i=i||t.languages;var s=i[e],o={};for(var u in s)if(s.hasOwnProperty(u)){if(u==n)for(var a in r)r.hasOwnProperty(a)&&(o[a]=r[a]);o[u]=s[u]}return i[e]=o},DFS:function(e,n){for(var r in e){n.call(e,r,e[r]);t.util.type(e)==="Object"&&t.languages.DFS(e[r],n)}}},highlightAll:function(e,n){var r=document.querySelectorAll('code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code');for(var i=0,s;s=r[i++];)t.highlightElement(s,e===!0,n)},highlightElement:function(r,i,s){var o,u,a=r;while(a&&!e.test(a.className))a=a.parentNode;if(a){o=(a.className.match(e)||[,""])[1];u=t.languages[o]}if(!u)return;r.className=r.className.replace(e,"").replace(/\s+/g," ")+" language-"+o;a=r.parentNode;/pre/i.test(a.nodeName)&&(a.className=a.className.replace(e,"").replace(/\s+/g," ")+" language-"+o);var f=r.textContent;if(!f)return;f=f.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/\u00a0/g," ");var l={element:r,language:o,grammar:u,code:f};t.hooks.run("before-highlight",l);if(i&&self.Worker){var c=new...