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- What are the performance implications of using the universal selector *?
- Using a universal selector does have performance impact in CSS, especially on large websites or complex pages. The selector matches every element on the page, including, and all child elements and pseudo-elements, causing the browser to check whether each DOM node applies styles and increase rendering workload. Common uses such as global reset styles or setting box-sizing, but these rules apply to unnecessary elements, adding redundant calculations. On large pages or low-end devices, performance losses are more obvious. Optimization method is to style only the required elements rather than use. However, during small websites, prototype development or debugging, the performance impact is negligible, and it is more efficient to use at this time. Overall, use of * should be limited in production environments or in large-scale sites to improve performance.
- CSS Tutorial . Web Front-end 134 2025-06-26 00:20:32
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- Flexbox and Grid: practical examples for each case
- Flexboxisidealforone-dimensionallayouts,whileGridexcelsintwo-dimensionallayouts.1)UseFlexboxforaligningitemsinasingledirection,likenavigationbars.2)UseGridforcomplexgridstructures,suchasresponsivephotogalleries.3)Combinebothforeffectivelayouts,usingG
- CSS Tutorial . Web Front-end 992 2025-06-26 00:19:02
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- What is the clearfix hack and is it still necessary?
- TheclearfixhackisaCSStechniqueusedtoensurecontainerswraparoundfloatedchildren,preventinglayoutcollapse.Itwasnecessaryinolderfloat-basedlayoutstoavoidissueslikemissingbackgroundsormisplacedfooters.Today,it’slargelyreplacedbyFlexboxandGrid,butmaystillb
- CSS Tutorial . Web Front-end 391 2025-06-26 00:17:41
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- CSS Animations: Create a professional website
- CSSanimationsenhanceprofessionalwebsitesbyimprovinguserengagementandvisualappeal.1)UseCSSforsmoothtransitionsandanimationswithoutJavaScript.2)Implementsimpleeffectslikebuttonhoverandloadingspinners.3)Optimizeperformancewithwill-change,mobile-friendly
- CSS Tutorial . Web Front-end 597 2025-06-26 00:10:21
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- What is the universal selector (*) and when should you use it?
- Universal selector* is used to match all elements in CSS and is often used to reset default styles, such as unified margin, padding, and box-sizing; however, it should be avoided in large projects to avoid affecting performance, and be careful to avoid affecting third-party libraries or nested components. Specific usage scenarios include: 1. Unify the basic style when resetting the style; 2. When limiting the scope of action, it can be defined in combination with the parent; 3. Use inheritance attributes with caution and can be used with: not() to exclude specific elements. Overall, use with caution to avoid potential problems.
- CSS Tutorial . Web Front-end 892 2025-06-26 00:10:01
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- Lightly Poking at the CSS if() Function in Chrome 137
- The CSS?if() function was recently implemented in Chrome 137, making it the first instance where we have it supported by a mainstream browser. Let's poke at it a bit at a very high level.
- CSS Tutorial . Web Front-end 247 2025-06-25 10:22:12
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- How do you create a flex container?
- To create a Flex container, simply set the display property to flex or inline-flex. 1. Use display:flex to create block-level containers, and the child elements are arranged horizontally by default; 2. Use display:inline-flex to create inline containers, and the width is determined by the content; 3. You can control the layout by adjusting the main axis direction, justify-content, and align-items attributes, such as horizontal distribution and vertical centering.
- CSS Tutorial . Web Front-end 197 2025-06-25 00:46:21
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- How can you inline critical CSS to improve initial page load time?
- InliningcriticalCSSspeedsupinitialpageloadbyembeddingessentialstylesdirectlyinHTML.1.IdentifycriticalCSSforabove-the-foldcontentusingtoolslikePenthouseorplugins.2.Inlinethesestylesinataginsidetoreducerender-blockingresources.3.Loadnon-criticalCSSasyn
- CSS Tutorial . Web Front-end 674 2025-06-25 00:46:01
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- What is the difference between a pseudo-class and a pseudo-element?
- Apseudo-classtargetselementsbasedonstateorposition,whileapseudo-elementstylespartsofanelementnotpresentintheDOM.1.Pseudo-classeslike:hover,:focus,:nth-child(),and:visitedtargetelementstatesorpositions.2.Pseudo-elementslike::before,::after,::first-lin
- CSS Tutorial . Web Front-end 388 2025-06-25 00:44:01
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- What is the difference between a class selector and an ID selector?
- 1. ID selector is used for unique elements, class selector is used for multiple elements. 2. ID has higher priority and is not repeatable, suitable for unique elements such as navigation bars or anchor links; class selectors are more flexible and reusable, suitable for applications of the same style and modular components in many places. 3. Developers sometimes avoid using IDs because of high specificity that may cause style overwrite problems, but it is still useful in JavaScript and URL fragments.
- CSS Tutorial . Web Front-end 234 2025-06-25 00:43:40
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- How does the will-change property improve performance?
- The will-change attribute should be used with caution to optimize performance, which enables the browser to pre-optimize rendering and synthesis by informing the browser element of possible changes in properties. It should be used when the animation is not simple, has lag or affects the user experience, such as transform, opacity, top, left, width, height and other attributes, and should be removed in time after the animation is over; avoid excessive use to avoid excessive memory usage or slow rendering. Specific operations include: 1. Dynamically add will-change before the change occurs; 2. Restore to auto after the animation is over; 3. Apply only to key elements. In addition, other performance optimization methods need to be combined, such as using hardware acceleration attributes and reducing layout jitter
- CSS Tutorial . Web Front-end 476 2025-06-25 00:42:00
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- What Can You Do With CSS Animations? A Comprehensive Guide
- CSSanimationscanenhancewebprojectsinseveralways:1)Createhovereffects,likescalingbuttons;2)Designloadingindicators,suchasspinningloaders;3)Developmulti-stageanimations,likecharactermovements;4)Optimizeperformancebyanimatingtransformandopacity;5)Ensure
- CSS Tutorial . Web Front-end 527 2025-06-25 00:41:41
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- How to select an element based on its language with the :lang() pseudo-class?
- The :lang() pseudo-class selects elements and applies styles through the HTML lang attribute. It is written as element:lang(lang-code), and supports ISO standard language code. 1. Ensure that the lang attributes are correctly set by HTML elements; 2. Use lang (language code) to write corresponding CSS rules; 3. Apply to differentiated control of multilingual websites, such as fonts, font chokes and other scenarios. It should be noted that it does not rely on content recognition and does not inherit the parent language settings.
- CSS Tutorial . Web Front-end 492 2025-06-25 00:41:11
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- How to combine multiple conditions in a single media query?
- The method of using media query to satisfy multiple conditions at the same time in CSS is as follows: 1. Use and to connect multiple conditions to ensure that all conditions are true, such as @mediascreenand(min-width:600px)and(max-width:900px)and(min-device-pixel-ratio:2); 2. Use commas to represent the relationship of "or", as long as one of the conditions is satisfied, such as @media(max-width:480px),(max-height:320px); 3. The logical priority can be clarified through brackets to enhance readability; 4. Use not to negate a certain condition, such as @media, for example, @media(max-width:480px),(max-height:320px); 3. The logical priority can be clarified through brackets to enhance readability; 4. Use not to negate a certain condition, such as @media
- CSS Tutorial . Web Front-end 459 2025-06-25 00:38:51
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