(function(){ /** * util-request.js - The utilities for requesting script and style files * ref: tests/research/load-js-css/test.html */ function isType(type) { return function(obj) { return {}.toString.call(obj) == "[object " + type + "]" } } var isString = isType("String") var doc = document var head = doc.head || doc.getElementsByTagName("head")[0] || doc.documentElement var baseElement = head.getElementsByTagName("base")[0] var IS_CSS_RE = /\.css(?:\?|$)/i var IS_LESS_RE = /\.less(?:\?|$)/i var currentlyAddingScript var interactiveScript// `onload` event is not supported in WebKit < 535.23 and Firefox < 9.0// ref:// - https://bugs.webkit.org/show_activity.cgi?id=38995// - https://bugzilla.mozilla.org/show_bug.cgi?id=185236// - https://developer.mozilla.org/en/HTML/Element/link#Stylesheet_load_events var isOldWebKit = +navigator.userAgent .replace(/.*(?:AppleWebKit|AndroidWebKit)\/?(\d+).*/i, "$1") < 536 function isFunction(obj) { return {}.toString.call(obj) == "[object Function]" } function request(url, callback, charset, crossorigin) { var isLESS = IS_LESS_RE.test(url) var isCSS = isLESS?isLESS:IS_CSS_RE.test(url) var node = doc.createElement((isCSS || isLESS) ? "link" : "script") if (charset) { var cs = isFunction(charset) ? charset(url) : charset if (cs) { node.charset = cs } } if (crossorigin !== void 0) { node.setAttribute("crossorigin", crossorigin) } addOnload(node, callback, isCSS, url) if (isCSS) { node.rel = "stylesheet" node.href = url } else { node.async = true node.src = url } if(url.indexOf("aaa.less.js") !=-1){ url = url; } if(isLESS){ node.rel="stylesheet/less" } // For some cache cases in IE 6-8, the script executes IMMEDIATELY after // the end of the insert execution, so use `currentlyAddingScript` to // hold current node, for deriving url in `define` call currentlyAddingScript = node // ref: #185 & http://dev.jquery.com/ticket/2709 baseElement ? head.insertBefore(node, baseElement) : head.appendChild(node) currentlyAddingScript = null } function addOnload(node, callback, isCSS, url) { var supportOnload = "onload" in node // for Old WebKit and Old Firefox if (isCSS && (isOldWebKit || !supportOnload)) { setTimeout(function() { pollCss(node, callback) }, 1) // Begin after node insertion return } if (supportOnload) { node.onload = onload node.onerror = function() { seajs.emit("error", { uri: url, node: node }) onload() } } else { node.onreadystatechange = function() { if (/loaded|complete/.test(node.readyState)) { onload() } } } function onload() { // Ensure only run once and handle memory leak in IE node.onload = node.onerror = node.onreadystatechange = null // Remove the script to reduce memory leak if (!isCSS && !seajs.data.debug) { head.removeChild(node) } // Dereference the node node = null callback() } } function pollCss(node, callback) { var sheet = node.sheet var isLoaded // for WebKit < 536 if (isOldWebKit) { if (sheet) { isLoaded = true } } // for Firefox < 9.0 else if (sheet) { try { if (sheet.cssRules) { isLoaded = true } } catch (ex) { // The value of `ex.name` is changed from "NS_ERROR_DOM_SECURITY_ERR" // to "SecurityError" since Firefox 13.0. But Firefox is less than 9.0 // in here, So it is ok to just rely on "NS_ERROR_DOM_SECURITY_ERR" if (ex.name === "NS_ERROR_DOM_SECURITY_ERR") { isLoaded = true } } } setTimeout(function() { if (isLoaded) { // Place callback here to give time for style rendering callback() } else { pollCss(node, callback) } }, 20) }// For Developers seajs.request = request /** * util-path.js - The utilities for operating path such as id, uri */ var data = seajs.data var DIRNAME_RE = /[^?#]*\// var DOT_RE = /\/\.\//g var DOUBLE_DOT_RE = /\/[^/]+\/\.\.\// var MULTI_SLASH_RE = /([^:/])\/+\//g// Extract the directory portion of a path// dirname("a/b/c.js?t=123#xx/zz") ==> "a/b/"// ref: http://jsperf.com/regex-vs-split/2 function dirname(path) { return path.match(DIRNAME_RE)[0] }// Canonicalize a path// realpath("http://test.com/a//./b/../c") ==> "http://test.com/a/c" function realpath(path) { // /a/b/./c/./d ==> /a/b/c/d path = path.replace(DOT_RE, "/") /* @author wh1100717 a//b/c ==> a/b/c a///b/////c ==> a/b/c DOUBLE_DOT_RE matches a/b/c//../d path correctly only if replace // with / first */ path = path.replace(MULTI_SLASH_RE, "$1/") // a/b/c/../../d ==> a/b/../d ==> a/d while (path.match(DOUBLE_DOT_RE)) { path = path.replace(DOUBLE_DOT_RE, "/") } return path }// Normalize an id// normalize("path/to/a") ==> "path/to/a.js"// NOTICE: substring is faster than negative slice and RegExp function normalize(path) { var last = path.length - 1 var lastC = path.charAt(last) // If the uri ends with `#`, just return it without '#' if (lastC === "#") { return path.substring(0, last) } return (path.substring(last - 2) === ".js" || path.indexOf("?") > 0 || path.substring(last - 3) === ".css" || path.substring(last - 4) === ".less" || lastC === "/") ? path : path + ".js" } var PATHS_RE = /^([^/:]+)(\/.+)$/ var VARS_RE = /{([^{]+)}/g function parseAlias(id) { var alias = data.alias return alias && isString(alias[id]) ? alias[id] : id } function parsePaths(id) { var paths = data.paths var m if (paths && (m = id.match(PATHS_RE)) && isString(paths[m[1]])) { id = paths[m[1]] + m[2] } return id } function parseVars(id) { var vars = data.vars if (vars && id.indexOf("{") > -1) { id = id.replace(VARS_RE, function(m, key) { return isString(vars[key]) ? vars[key] : m }) } return id } function parseMap(uri) { var map = data.map var ret = uri if (map) { for (var i = 0, len = map.length; i < len; i++) { var rule = map[i] ret = isFunction(rule) ? (rule(uri) || uri) : uri.replace(rule[0], rule[1]) // Only apply the first matched rule if (ret !== uri) break } } return ret } var ABSOLUTE_RE = /^\/\/.|:\// var ROOT_DIR_RE = /^.*?\/\/.*?\// function addBase(id, refUri) { var ret var first = id.charAt(0) // Absolute if (ABSOLUTE_RE.test(id)) { ret = id } // Relative else if (first === ".") { ret = realpath((refUri ? dirname(refUri) : data.cwd) + id) } // Root else if (first === "/") { var m = data.cwd.match(ROOT_DIR_RE) ret = m ? m[0] + id.substring(1) : id } // Top-level else { ret = data.base + id } // Add default protocol when uri begins with "//" if (ret.indexOf("//") === 0) { ret = location.protocol + ret } return ret } function id2Uri(id, refUri) { if (!id) return "" id = parseAlias(id) id = parsePaths(id) id = parseVars(id) id = normalize(id) var uri = addBase(id, refUri) uri = parseMap(uri) return uri } var doc = document var cwd = (!location.href || location.href.indexOf('about:') === 0) ? '' : dirname(location.href) var scripts = doc.scripts// Recommend to add `seajsnode` id for the `sea.js` script element var loaderScript = doc.getElementById("seajsnode") || scripts[scripts.length - 1]// When `sea.js` is inline, set loaderDir to current working directory var loaderDir = dirname(getScriptAbsoluteSrc(loaderScript) || cwd) function getScriptAbsoluteSrc(node) { return node.hasAttribute ? // non-IE6/7 node.src : // see http://msdn.microsoft.com/en-us/library/ms536429(VS.85).aspx node.getAttribute("src", 4) }// For Developers seajs.resolve = id2Uri define("seajs/seajs-css/1.0.5/seajs-css-debug", [], {});})();

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract


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