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- How to center a div in CSS?
- The method of centering a div depends on the requirements: 1. Only use margin:0auto in horizontal centering; 2. Recommend Flexbox horizontally and vertically centering, set display:flex, justify-content:center and align-items:center; 3. If you use Grid layout, you can use display:grid to match place-items:center; 4. Compatible with old browsers, you can choose to add transform:translate (-50%,-50%); 5. Only use text-align:center. Flexbox is the most commonly used and flexible in modern times
- CSS Tutorial . Web Front-end 448 2025-08-05 21:13:01
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- PHP array: A method to efficiently determine whether there are multiple different values
- This tutorial will introduce in detail how to use the PHP built-in functions array_count_values() and count() to efficiently determine whether there are at least two different values in an array. This method is especially suitable for scenarios where it is necessary to quickly identify the diversity of elements in an array, avoiding complex loop traversals, thereby improving code performance and readability.
- PHP Tutorial . Backend Development 381 2025-08-05 21:12:01
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- How to create a responsive hero image with text overlay using CSS?
- Startwithacontainerusingabackgroundimageortagfortheherosection.2.ApplyCSSpropertieslikebackground-size:cover,height:80vh,andflexboxtoensureresponsivenessandcentering.3.Useapseudo-elementoverlay(::before)forbettertextcontrast.4.Positiontextwithz-index
- CSS Tutorial . Web Front-end 676 2025-08-05 21:08:00
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- How to create a text stroke effect with CSS?
- Using -webkit-text-stroke is the most reliable way to create text strokes. 1. Use -webkit-text-stroke to set the stroke width and color, such as 2pxblack; 2. Set color to transparent to achieve hollow text and only strokes are displayed; 3. If you need to fill in the color, you can set the color value such as white to achieve the red and white word effect; 4. This property is well supported in modern browsers, and Firefox and mobile browsers are compatible; 5. For old browsers that are not supported, the strokes are not displayed but the text is still visible, and it has elegant downgrades; 6. Text-shadow can be used to simulate strokes, but the effect is blurry and inaccurate, and it is only applicable to special
- CSS Tutorial . Web Front-end 491 2025-08-05 21:07:01
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- How to create a staggered animation with CSS?
- To create CSS interleaving animation, you need to set incremental animation-delay to make the elements play animations in turn. The specific methods are: 1. Apply the same animation for multiple elements but set gradually increasing animation-delay to achieve sequence effect; 2. Use CSS custom attributes combined with the calc() function to dynamically calculate the delay according to the element position to improve scalability; 3. Pack the labels separately for letters or words in the text and set the delay to implement word-by-word animation; 4. At present, the experimental cascade:add feature is not recommended. The delay increment should be kept between 0.05s and 0.2s, using animation-fill-mode:for
- CSS Tutorial . Web Front-end 200 2025-08-05 21:03:01
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- Efficient detection method for whether there are multiple different values in PHP arrays
- This article details how to efficiently detect whether at least two different values are contained in a PHP array. By using the array_count_values() function to count the number of occurrences of each element in the array and combining the count() function to determine the length of the result array, you can quickly determine whether there are heterogeneous elements in the original array. This approach is concise and efficient, especially for handling large data sets, such as verifying that the salesperson ID is unique.
- PHP Tutorial . Backend Development 316 2025-08-05 20:54:00
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- Validating HTML with the W3C Validator
- Verifying HTML code can detect hidden problems and improve web page quality. Use W3CValidator to submit verification by entering a URL, uploading a file, or pasting a code. After verification, errors and warnings will be listed, such as label not closed, attribute spelling errors, etc. Common errors include mismatch or unclosed labels, irregular attribute use, and obsolete labels. It is recommended to develop good indentation habits when writing HTML, use the editor's automatic closing function, wrap the attribute values in double quotes, avoid space misalignment, and use semantic tags to replace discarded tags. When verifying, pay attention to DOCTYPE declaration, importing JS and CSS from external links, generating static HTML and then verifying. Can integrate HTMLHint or grunt-contrib-htmlmin
- HTML Tutorial . Web Front-end 362 2025-08-05 20:53:02
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- How to manage focus with the tabindex attribute in HTML
- Usetabindex="0"tomakeelementsfocusableinnaturalorder,tabindex="-1"forprogrammaticfocusonly,andavoidpositivevalues;alwaysensurekeyboardoperabilityandmaintainlogicaltabordermatchingtheDOMstructuretosupportaccessibility.
- HTML Tutorial . Web Front-end 751 2025-08-05 20:50:04
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- How to use the HTML nav tag for navigation menus
- Use tags to define the main navigation areas, such as main menu, sidebar or paging links, to improve accessibility and SEO; 1. Use only in the main navigation blocks to avoid abuse; 2. Navigation links should be wrapped in or in a list to ensure clear semantics; 3. Add aria-label to multiple navigation areas to illustrate the purpose; 4. Use CSS for style design, such as flex layout to create horizontal menus; 5. Identify the current page through aria-current="page" to enhance screen reader support; 6. Avoid placing non-navigation content such as advertisements in it, and maintain structural semantics.
- HTML Tutorial . Web Front-end 767 2025-08-05 20:48:02
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- How to change the start number of an ordered list in HTML
- Yes, you can change the starting number of the ordered list by using the start attribute in the tag, for example, making the list number start from 5; 1. This attribute is only applicable to elements and accepts any positive integer; 2. It only affects the display number, not the list structure; 3. All mainstream browsers support it, HTML5 has re-supported this attribute; 4. It is often used to continue the list number of the previous part or match a specific document format; 5. You can also use CSS counters to achieve more flexible control, but the start attribute is simpler and sufficient to cope with most scenarios, so it is recommended to use the start="n" method first.
- HTML Tutorial . Web Front-end 500 2025-08-05 20:46:02
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- How to style the ::selection pseudo-element in CSS?
- To customize the style of text selected by users in a web page, you need to use the ::selection pseudo-element and consider browser compatibility. 1. Use basic syntax to set properties such as color, background-color, etc.; 2. Add ::-webkit-selection prefix to compatible old versions of WebKit browsers; 3. Only use supported CSS attributes to avoid invalid declarations; 4. You can limit the selected styles for specific elements; 5. Ensure that the color contrast meets readability requirements, thereby improving the user experience.
- CSS Tutorial . Web Front-end 116 2025-08-05 20:45:01
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- How to use the label tag to improve HTML form accessibility
- Alwaysassociatelabelswithforminputsusingtheforattributelinkedtotheinput’sid;2.Includelabelsevenforsimpleinputs,usingCSStovisuallyhidethemifneeded;3.Leveragelabelstoincreaseclickablearea,improvingusabilityonmobile;4.Preferexplicitlabelswithforandidove
- HTML Tutorial . Web Front-end 338 2025-08-05 20:43:02
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- How to use the bar element?
- Theelementisusedtodisplaytheprogressofataskwithknowncompletion.1.Usevalueandmaxattributestosetprogress,likefor30%completion.2.StyleitwithCSSusingbrowser-specificpseudo-elementssuchas::-webkit-progress-valueand::-moz-progress-barforconsistentappearanc
- HTML Tutorial . Web Front-end 205 2025-08-05 20:33:01
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- How to defer JavaScript loading in an HTML file for speed
- UsethedeferattributeforscriptsinorearlyintoallowbackgrounddownloadandexecutionafterHTMLparsing,ensuringorderedexecutionfordependentscripts;bestformostsitescriptsneedingfullDOMaccess.2.Useasyncfornon-critical,independentscriptslikeanalyticsorads,allow
- HTML Tutorial . Web Front-end 826 2025-08-05 20:30:03
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