\n<\/pre>\n\n\n\n

    Element:<\/strong>
    \nElements are the building blocks of a webpage and represent the various types of content and structure in the document.<\/p>\n\n

    Components of an HTML Element:<\/strong><\/p>\n

    Opening Tag: The starting part of the element that defines the type of content that follows.\n    Example:

    ,

    ,
    , \n\nContent: The content placed between the opening and closing tags (if applicable). This could be text, images, links, or other elements.\n Example: This is a paragraph.\n\nClosing Tag: The closing part of the element that indicates the end of the element. It is the same as the opening tag, but with a forward slash (\/) before the tag name.\n Example: <\/p>, <\/h1>, <\/div>\n\nAttributes (Optional): Additional properties that provide extra information about the element. Attributes are added inside the opening tag.\n Example:>\n

    Example:<\/strong>
    \n<\/p>\n\n

    \n\n    ILUGC<\/title>\n<style>\n.container{\n    border:1px solid;\n    height:200%;\n    width:85%;\n    margin:auto;\n}\n.header h4{\n    text-transform: uppercase;\n    color:#e22d30;\n    border-top:1px solid green;\n    width: fit-content;\n    padding-top:10px;\n}\n.header{\n\n    margin:25px;\n}\n<\/style>\n<\/head>\n<body>
    <h1><a href="http://miracleart.cn/">国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂</a></h1>\n   <div>\n\n\n\n<p><strong>Explanation of the HTML Structure:<\/strong><br>\n<\/p>\n\n<pre><html>: Root element of the HTML document.\n        <head>: Contains metadata for the page, including the title and styles.\n        <body>:Contains the content visible on the page.\n\n    Inside the <head>:\n        The <title> tag gives the webpage its title when viewed in the browser tab.\n        The <style> tag contains the internal CSS to style the page.\n\n    Inside the <body>:\n\n        .container:A container div with a class container that holds all the page elements.\n            It's styled with a border, height, width, and centered using margin:auto.\n\n        .header: A section that contains the main title (<h1>) and a subtitle (<h4>) about the ILUGC group.\n            The h4 tag is styled with uppercase letters, a red color, a border on top, and some padding.\n\n        navbar: This seems to be a placeholder for a navigation bar.\n\n        layout: A section for the main content layout, with two subsections:\n            mainLayout: Likely for the main content area.\n            sideLayout: Likely for a sidebar or additional content.\n\n        footer: Placeholder for the footer section.\n\n<\/pre>\n\n\n\n<p><strong>div:<\/strong><br>\nThe element is a block-level container used to group other elements together and apply styling or layout properties to them.<\/p>\n\n<p><strong>Class Selector:<\/strong><\/p>\n\n<p>The class selector is used to select and style elements that have a specific class attribute. It is one of the most commonly used selectors in CSS. A class selector is defined by a dot (.) followed by the class name.<\/p>\n\n<p><strong>Syntax:<\/strong><br>\n<\/p>\n\n<pre>.classname {\n\n}\n<\/pre>\n\n\n\n<p><strong>Element Selector:<\/strong><\/p>\n\n<p>The element selector (also known as the type selector) is used to select and style HTML elements based on their tag name. It allows you to apply styles to all instances of a particular type of HTML element in the document.<\/p>\n\n<p><strong>Syntax:<\/strong><br>\n<\/p>\n\n<pre>element {\n\n}\n<\/pre>\n\n\n\n<p><strong>margin:<\/strong><\/p>\n\n<p>The margin property in CSS is used to create space outside an element.<\/p>\n\n<p><strong>Syntax:<\/strong><br>\n<\/p>\n\n<pre>element {\n  margin: value;\n}\n<\/pre>\n\n\n\n<p>padding:<\/p>\n\n<p>The padding property in CSS is used to create space inside an element, between the content and the border. <\/p>\n\n<p><strong>Syntax:<\/strong><br>\n<\/p>\n\n<pre>element {\n  padding: value;\n}\n<\/pre>\n\n\n\n\n          \n\n            \n        <\/pre><\/pre>"}	</script>
    	
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    						<span>Day -HTML ans CSS</span>
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    							<h1 class="Articlelist_txts_title">Day -HTML ans CSS</h1>
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    							<span id="377j5v51b"    class="Articlelist_txts_time">Jan 03, 2025 pm	 08:54 PM</span>
    														
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    					<p><strong>HTML:</strong><br>
    HTML stand for Hyper Text Markup Language.<br>
    HTML is the standard language used to create web pages. <br>
    It defines the structure of a webpage using a system of tags or elements.</p>
    
    <p><strong>CSS:</strong></p>
    
    <p>CSS stands for Cascading Style Sheets. <br>
    It is used to style and format the layout of a webpage created with HTML. <br>
    It controls things like colors, fonts, spacing, positioning, and responsive design. <br>
    CSS allows you to separate the structure (HTML) from the design (styles), making the website easier to maintain and more flexible.</p>
    
    <p><strong>JS:</strong><br>
    Js stands for JavaScript.<br>
    It is a programming language used to create dynamic and interactive effects within web browsers. <br>
    While HTML structures the page and CSS styles it, JavaScript enables interaction with the page and can modify the content dynamically.</p>
    
    <p><strong>HTML:</strong><br>
    HTML is text based language that defines the structure and meaning of web content.</p>
    
    <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173590888843410.jpg" class="lazy" alt="Day -HTML ans CSS"></p>
    
    <p><strong>Stand alone tags:</strong><br>
    In HTML, stand-alone tags refer to HTML elements that don't require a closing tag. These are also often referred to as self-closing tags or void elements.</p>
    
    <p><strong>Example:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false"><br>
    <hr>
    <input>
    </pre>
    
    
    
    <p><strong>Structure tags:</strong><br>
    Tags typically come in pairs: an opening tag and a closing tag.</p>
    
    <p><strong>Example:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false"><html>
    <head>
    <body>
    </pre>
    
    
    
    <p><strong>Element:</strong><br>
    Elements are the building blocks of a webpage and represent the various types of content and structure in the document.</p>
    
    <p><strong>Components of an HTML Element:</strong></p>
    <pre class="brush:php;toolbar:false">Opening Tag: The starting part of the element that defines the type of content that follows.
        Example:<p>, <h1>, <div>, <img>
    
    Content: The content placed between the opening and closing tags (if applicable). This could be text, images, links, or other elements.
        Example: This is a paragraph.
    
    Closing Tag: The closing part of the element that indicates the end of the element. It is the same as the opening tag, but with a forward slash (/) before the tag name.
       Example: </p>, </h1>, </div>
    
    Attributes (Optional): Additional properties that provide extra information about the element. Attributes are added inside the opening tag.
        Example:>
    <p><strong>Example:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false"><html>
    <head>
        <title>ILUGC</title>
    <style>
    .container{
        border:1px solid;
        height:200%;
        width:85%;
        margin:auto;
    }
    .header h4{
        text-transform: uppercase;
        color:#e22d30;
        border-top:1px solid green;
        width: fit-content;
        padding-top:10px;
    }
    .header{
    
        margin:25px;
    }
    </style>
    </head>
    <body>
       <div>
    
    
    
    <p><strong>Explanation of the HTML Structure:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false"><html>: Root element of the HTML document.
            <head>: Contains metadata for the page, including the title and styles.
            <body>:Contains the content visible on the page.
    
        Inside the <head>:
            The <title> tag gives the webpage its title when viewed in the browser tab.
            The <style> tag contains the internal CSS to style the page.
    
        Inside the <body>:
    
            .container:A container div with a class container that holds all the page elements.
                It's styled with a border, height, width, and centered using margin:auto.
    
            .header: A section that contains the main title (<h1>) and a subtitle (<h4>) about the ILUGC group.
                The h4 tag is styled with uppercase letters, a red color, a border on top, and some padding.
    
            navbar: This seems to be a placeholder for a navigation bar.
    
            layout: A section for the main content layout, with two subsections:
                mainLayout: Likely for the main content area.
                sideLayout: Likely for a sidebar or additional content.
    
            footer: Placeholder for the footer section.
    
    </pre>
    
    
    
    <p><strong>div:</strong><br>
    The element is a block-level container used to group other elements together and apply styling or layout properties to them.</p>
    
    <p><strong>Class Selector:</strong></p>
    
    <p>The class selector is used to select and style elements that have a specific class attribute. It is one of the most commonly used selectors in CSS. A class selector is defined by a dot (.) followed by the class name.</p>
    
    <p><strong>Syntax:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false">.classname {
    
    }
    </pre>
    
    
    
    <p><strong>Element Selector:</strong></p>
    
    <p>The element selector (also known as the type selector) is used to select and style HTML elements based on their tag name. It allows you to apply styles to all instances of a particular type of HTML element in the document.</p>
    
    <p><strong>Syntax:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false">element {
    
    }
    </pre>
    
    
    
    <p><strong>margin:</strong></p>
    
    <p>The margin property in CSS is used to create space outside an element.</p>
    
    <p><strong>Syntax:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false">element {
      margin: value;
    }
    </pre>
    
    
    
    <p>padding:</p>
    
    <p>The padding property in CSS is used to create space inside an element, between the content and the border. </p>
    
    <p><strong>Syntax:</strong><br>
    </p>
    
    <pre class="brush:php;toolbar:false">element {
      padding: value;
    }
    </pre>
    
    
    
    
              
    
                
            </pre></pre><p>The above is the detailed content of Day -HTML ans CSS. For more information, please follow other related articles on the PHP Chinese website!</p>
    
    
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    								<p class="Articlelist_txts_p">CSS blocks page rendering because browsers view inline and external CSS as key resources by default, especially with imported stylesheets, header large amounts of inline CSS, and unoptimized media query styles. 1. Extract critical CSS and embed it into HTML; 2. Delay loading non-critical CSS through JavaScript; 3. Use media attributes to optimize loading such as print styles; 4. Compress and merge CSS to reduce requests. It is recommended to use tools to extract key CSS, combine rel="preload" asynchronous loading, and use media delayed loading reasonably to avoid excessive splitting and complex script control.</p>
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    								<p class="Articlelist_txts_p">ThebestapproachforCSSdependsontheproject'sspecificneeds.Forlargerprojects,externalCSSisbetterduetomaintainabilityandreusability;forsmallerprojectsorsingle-pageapplications,internalCSSmightbemoresuitable.It'scrucialtobalanceprojectsize,performanceneed</p>
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    								<a href="http://miracleart.cn/faq/1796821588.html" title="Does my CSS must be on lower case?" class="phphistorical_Version2_mids_title">Does my CSS must be on lower case?</a>
    								<span id="377j5v51b"    class="Articlelist_txts_time">Jun 19, 2025 am	 12:29 AM</span>
    								<p class="Articlelist_txts_p">No,CSSdoesnothavetobeinlowercase.However,usinglowercaseisrecommendedfor:1)Consistencyandreadability,2)Avoidingerrorsinrelatedtechnologies,3)Potentialperformancebenefits,and4)Improvedcollaborationwithinteams.</p>
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    								<p class="Articlelist_txts_p">CSSismostlycase-insensitive,butURLsandfontfamilynamesarecase-sensitive.1)Propertiesandvalueslikecolor:red;arenotcase-sensitive.2)URLsmustmatchtheserver'scase,e.g.,/images/Logo.png.3)Fontfamilynameslike'OpenSans'mustbeexact.</p>
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    								<span id="377j5v51b"    class="Articlelist_txts_time">Jul 02, 2025 am	 01:15 AM</span>
    								<p class="Articlelist_txts_p">Autoprefixer is a tool that automatically adds vendor prefixes to CSS attributes based on the target browser scope. 1. It solves the problem of manually maintaining prefixes with errors; 2. Work through the PostCSS plug-in form, parse CSS, analyze attributes that need to be prefixed, and generate code according to configuration; 3. The usage steps include installing plug-ins, setting browserslist, and enabling them in the build process; 4. Notes include not manually adding prefixes, keeping configuration updates, prefixes not all attributes, and it is recommended to use them with the preprocessor.</p>
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    								<span id="377j5v51b"    class="Articlelist_txts_time">Jun 19, 2025 am	 12:27 AM</span>
    								<p class="Articlelist_txts_p">In CSS, selector and attribute names are case-sensitive, while values, named colors, URLs, and custom attributes are case-sensitive. 1. The selector and attribute names are case-insensitive, such as background-color and background-Color are the same. 2. The hexadecimal color in the value is case-sensitive, but the named color is case-sensitive, such as red and Red is invalid. 3. URLs are case sensitive and may cause file loading problems. 4. Custom properties (variables) are case sensitive, and you need to pay attention to the consistency of case when using them.</p>
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