<script>标签用于<noscript>标签内的目的是什么?

最近我在有趣的devise和内容的网站上进行了“查看源代码”狂欢。 其中一个网站Squarespace在<noscript>标签中包含<script>标记块,如下所示:

 <!-- Page is at: http://squarespace.com --> ... ... <noscript id="inline-deps"> <link rel="stylesheet" type="text/css" href="//cloud.typography.com/7811972/758964/css/fonts.css" /> <script type="text/javascript" src="https://static.squarespace.com/static/ta/5134cbefe4b0c6fb04df8065/7400/assets/logomark/logomark.min.js?37"></script> <link rel="stylesheet" href="https://static.squarespace.com/static/ta/5134cbefe4b0c6fb04df8065/7400/assets/logomark/logomark.min.css?37" type="text/css" /> </noscript> ... ... 

它让我感到奇怪,并且让我search信息,看看是否有这样一个奇怪的HTML的某种隐藏的function/目的,但无济于事。 在<noscript>元素中使用<script>标记是否有某种目的,或者这仅仅是错误的HTML的一个例子?

我做了一些search他们的代码,发现这个片段(我已经清理它,使其更具可读性):

 var DepLoader = (function () { function init() { var dependencies = document.getElementById("inline-deps"); if (!dependencies || JS.hasClass(document.body, "deps--loaded")) { webfontsReady(); } else { var html = dependencies.innerText || dependencies.textContent; JS.addClass(document.body, "deps--loaded"); processRaw(html); } } function isListed(a, b) { for (var i = 0; i < b.length; i++) { if (a.indexOf(b[i]) !== -1) { return true; } } return false; } function webfontsReady() { JS.fireCustom("webfontsReady"); } function processRaw(html) { var el = document.createElement("div"); el.innerHTML = html; var scripts = el.querySelectorAll("script"); var styles = el.querySelectorAll("link"); var common, signup, dialog, systemPage, commerce; var others = []; var inline = []; var styleWhiteList = ["site.css", "dialog-", "signup-", "logomark"]; var scriptBlackList = ["management-", "ckeditor-"]; for (var i = 0; i < styles.length; i++) { var style = styles[i]; if (style.href.indexOf("fonts.css") !== -1) load(style, webfontsReady); if (isListed(style.href, styleWhiteList)) load(style); } for (var i = 0; i < scripts.length; i++) { var script = scripts[i]; var src = script.src; if (!src && script.getAttribute("data-sqs-type") !== "dynamic-assets-loader" && script.innerHTML.indexOf("SQUARESPACE_ROLLUPS") === -1) { eval(script.innerHTML); } } if (window.SQUARESPACE_ROLLUPS) { for (var key in SQUARESPACE_ROLLUPS) { var rollup = SQUARESPACE_ROLLUPS[key]; var js = rollup.js; var css = rollup.css; if (key.indexOf("common") !== -1) { common = js; } else if (key.indexOf("commerce") !== -1) { commerce = js; } else if (key.indexOf("signup") !== -1) { signup = js; } else if (key.indexOf("dialog") !== -1) { dialog = js; } else if (key.indexOf("system-page") !== -1) { systemPage = js; } else if (key) { others = others.concat(js); } else { inline = inline.concat(js); } } } for (var i = 0; i < scripts.length; s++) { var script = scripts[i]; var src = script.src; if (!isListed(src, scriptBlackList)) { if (src.indexOf("common-") !== -1) { common = script; } else if (src.indexOf("commerce-") !== -1) { commerce = script; } else if (src.indexOf("signup-") !== -1) { signup = script; } else if (src.indexOf("dialog-") !== -1) { dialog = script; } else if (src.indexOf("system-page-") !== -1) { systemPage = script; } else if (src) { others.push(script); } else { inline.push(script); } } } function loadOthers() { for (var i = 0; i < inline.length; i++) { if (inline[i].getAttribute("data-sqs-type") !== "dynamic-assets-loader") { load(inline[a]); } } for (var i = 0; i < others.length; i++) { load(others[i]); } JS.fireCustom("dependenciesLoaded"); } var loadSystemPage = load.bind(this, systemPage, loadOthers, "system page"); var loadSignup = load.bind(this, signup, loadSystemPage, "signup"); var loadCommerce = load.bind(this, commerce, loadSignup, "commerce"); var loadDialog = load.bind(this, dialog, loadCommerce, "dialog"); var loadCommon = load.bind(this, common, loadDialog, "common"); loadCommon(); } function load(tag, callback, label) { var head = document.head; if (Array.isArray(tag)) tag = { nodeName: "SCRIPT", src: tag[0] }; if (!tag) { if (callback) callback(); return; } if (tag && (tag.src || tag.href)) { var child; if ("SCRIPT" === tag.nodeName) { child = document.createElement("script"); child.src = tag.src; if (child.src.indexOf("combo") !== -1) { callback = function () { Y.Squarespace.FrontSite.Core.domReady(true) }; } } else { if ("LINK" === tag.nodeName && "stylesheet" === tag.rel) { child = document.createElement("link"); child.href = tag.href; child.rel = "stylesheet"; child.tyle = "text/css"; } if (child) { child.onload = callback; head.appendChild(child); } } } else { try { eval(tag.innerHTML); } catch (e) {} } } return { init: init, webfontsReady: webfontsReady }; })(); 

如您所见, <noscript>标记具有ID #inline-deps ,它在代码(第3行)中被引用以asynchronous和按需加载依赖关系。

他们可能使用<noscript>元素,因为它允许他们直接访问DOM元素,而不必将其放在string或评论(我认为特别糟糕,因为评论不是实际的信息的意思),然后parsing它。 它还会阻止脚本和CSS样式的执行,直到特别加载。

我个人发现这是滥用<noscript>标签。 我甚至不确定它是否是有效的HTML5代码。 在可行的情况下,应该使用其他方法,例如用脚本加载器在JavaScript对象中声明依赖关系。