Appending Elements to HTML Head with jQuery/JavaScript
Many content management systems (CMSs) restrict the editing of HTML source for the
element. However, it is often necessary to add elements to this section, such as meta tags or links.
Question:
How can I add elements within the
section using jQuery/JavaScript, particularly above the
tag? For instance, I want to add the following meta tag:</p>
<p><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /></p>
<p><strong>Answer:</strong></p>
<p>To append elements to the <head> section, you can use the append() method available in both jQuery and vanilla JavaScript. Here's how:</p>
<pre class="brush:php;toolbar:false"><code class="javascript">$('head').append('<link />');</code></pre>
<p>For the specific meta tag you want to add, you can modify the code as follows:</p>
<pre class="brush:php;toolbar:false"><code class="javascript">$('head').append('<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />');</code></pre><p>The above is the detailed content of How to Append Elements to the HTML Head with jQuery/JavaScript?. For more information, please follow other related articles on the PHP Chinese website!</p>
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<span>31</span>
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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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<span id="377j5v51b" class="Articlelist_txts_time">Jun 20, 2025 am 12:45 AM</span>
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<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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<span id="377j5v51b" class="Articlelist_txts_time">Jun 20, 2025 am 12:09 AM</span>
<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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<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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<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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<span id="377j5v51b" class="Articlelist_txts_time">Jun 19, 2025 am 12:38 AM</span>
<p class="Articlelist_txts_p">CSSselectorsandpropertynamesarecase-insensitive,whilevaluescanbecase-sensitivedependingoncontext.1)Selectorslike'div'and'DIV'areequivalent.2)Propertiessuchas'background-color'and'BACKGROUND-COLOR'aretreatedthesame.3)Valueslikecolornamesarecase-insens</p>
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