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  • Scroll-Driven Sticky Heading
    Scroll-Driven Sticky Heading
    I was playing around with scroll-driven animations, just searching for all sorts of random things you could do. That’s when I came up with the idea to animate main headings and, using scroll-driven animations, change the headings based on the user’s
    CSS Tutorial . Web Front-end 357 2025-07-12 09:34:15
  • Using CSS filters for visual effects
    Using CSS filters for visual effects
    CSS filters can achieve a variety of visual effects. 1. Use grayscale() to convert the picture into a grayscale diagram, which is often used for interactive state switching; 2. blur() realizes Gaussian blur, suitable for background blur and other scenarios; 3. Adjust the brightness, contrast and saturation through brightness(), contrast(), and saturate() respectively, and use it in combination to create a diverse tone; 4. Multiple filters can be used by superimposing spaces, but attention should be paid to the order and performance impact. These filters are simple and efficient, suitable for enhancing page expression.
    CSS Tutorial . Web Front-end 941 2025-07-12 03:22:20
  • How to use CSS custom properties for theming tutorial
    How to use CSS custom properties for theming tutorial
    CSS custom attributes are a flexible way to implement theme switching. They abstract colors, fonts and other styles for easy management and dynamic modification. Compared to traditional multi-CSS files or preprocessor variables, CSS variables support runtime changes, suitable for dark mode and user-defined themes. It is recommended to define default variables in :root, create classes such as .dark for different topics, and toggle class names through JS to achieve dynamic topic switching. At the same time, you can use localStorage to remember user selections. Pay attention to variable scope, fallback value, performance and compatibility issues in details.
    CSS Tutorial . Web Front-end 534 2025-07-12 03:22:01
  • Understanding the css box-sizing property: content-box vs border-box
    Understanding the css box-sizing property: content-box vs border-box
    Why does a box with a width of 100px be displayed wider? Because the content-box model is used by default, the actual width includes content, padding and border. 1. By default, box-sizing is content-box, and the width set only refers to the content area. padding and border will add additional overall width; 2. Use border-box to make the width set include content, padding and border, and the layout is more intuitive; 3. It is recommended to set box-sizing: border-box globally to avoid layout misalignment, which is especially suitable for responsive design; 4. Conte can be used in special scenarios
    CSS Tutorial . Web Front-end 318 2025-07-12 03:21:20
  • Troubleshooting CSS `z-index` stacking contexts
    Troubleshooting CSS `z-index` stacking contexts
    The reason why z-index does not take effect is the effect of the stacking context. ①z-index is only valid for positioning elements and must be in the same stacking context; ② stackingcontext is an independent space created by the parent element, and the stacking order of child elements is only effective in that space; ③ The way to create a new stackingcontext includes using transform, opacity, filter and other attributes; ④ Common problems are that z-index in different stackingcontexts cannot be directly compared, so you need to check whether the common ancestor has created stackingcontext; ⑤ The troubleshooting method is to view the parent element style through the developer tool
    CSS Tutorial . Web Front-end 765 2025-07-12 03:20:30
  • What is a CSS Box Model tutorial?
    What is a CSS Box Model tutorial?
    TheCSSBoxModelisessentialforcontrollingwebpagelayout,aseveryelementistreatedasaboxwithfourcomponents:content,padding,border,andmargin.1.Thecontentareaholdstextorimages.2.Paddingaddsinternalspacebetweencontentandborder.3.Borderwrapsaroundpaddingandcon
    CSS Tutorial . Web Front-end 653 2025-07-12 03:20:10
  • Creating modal windows or lightboxes with css
    Creating modal windows or lightboxes with css
    Modal windows and light boxes can implement basic functions through pure CSS without JavaScript. 1. Use: The target pseudo-class can control the display status based on URL anchor points. The advantage is that there is no script required, but the mask cannot be closed; 2. Use hidden checkbox and label to achieve more flexible interaction, such as clicking mask to close and adding animation transitions; 3. Pay attention to optimization details such as compatibility, accessibility (such as adding aria-label), and preventing background scrolling (using overflow:hidden). The two methods have their own applicable scenarios, suitable for static pages or lightweight projects.
    CSS Tutorial . Web Front-end 988 2025-07-12 03:18:41
  • Working with CSS Blend Modes for creative design
    Working with CSS Blend Modes for creative design
    CSSBlendModes realizes color fusion between elements through mix-blend-mode and background-blend-mode attributes, improving the visual level. 1. Mix-blend-mode controls the mixing method of elements and the content below; 2. Background-blend-mode controls the mixing between multiple background layers; 3. Common modes such as multiply, screen, and overlay can be used for background overlay, text effects and card light and shadow effects; 4. When using it, you need to pay attention to compatibility, performance impact, color control and hierarchical structure issues.
    CSS Tutorial . Web Front-end 307 2025-07-12 03:18:00
  • How is specificity calculated for CSS Selectors?
    How is specificity calculated for CSS Selectors?
    CSS specificity is the mechanism by which browsers decide which style is preferred among multiple conflict rules. It calculates weights based on the structure of the selector, not the order of the code. Specificity consists of four digits: a (inline style), b (ID selector), c (class, attribute, pseudo-class), d (element, pseudo-element). For example, the specificity of p is (0,0,0,1), #mainp is (0,1,0,1), and style="..." is (1,0,0,0). A common misunderstanding is that multiple classes can exceed IDs, but they are not. It is recommended to use less ID styles and use more class combinations to avoid abuse of !important to improve maintainability.
    CSS Tutorial . Web Front-end 348 2025-07-12 03:17:40
  • How does php implement namespaces and autoloading with Composer?
    How does php implement namespaces and autoloading with Composer?
    PHPusesnamespacestoorganizecodeandavoidnamingconflictsbygroupingrelatedclassesunderlogicalprefixes,forexampledefiningaclassintheApp\UtilitiesnamespacewithnamespaceApp\Utilities;.ComposerenhancesthisbyimplementingautoloadingthroughconfigurationslikePS
    PHP Tutorial . Backend Development 627 2025-07-12 03:16:01
  • How to access a character in a string by index in PHP
    How to access a character in a string by index in PHP
    In PHP, you can use square brackets or curly braces to obtain string specific index characters, but square brackets are recommended; the index starts from 0, and the access outside the range returns a null value and cannot be assigned a value; mb_substr is required to handle multi-byte characters. For example: $str="hello";echo$str[0]; output h; and Chinese characters such as mb_substr($str,1,1) need to obtain the correct result; in actual applications, the length of the string should be checked before looping, dynamic strings need to be verified for validity, and multilingual projects recommend using multi-byte security functions uniformly.
    PHP Tutorial . Backend Development 774 2025-07-12 03:15:40
  • Understanding CSS inheritance and cascade
    Understanding CSS inheritance and cascade
    CSS inheritance is a mechanism in which some attributes are automatically passed to child elements. For example, text attributes such as color and font-family will be inherited by child elements by default, while layout attributes such as border and margin will not. For example, the parent sets color:blue, and the child element will inherit blue if it is not set in color. Common inheritable attributes include 1.color2.font-family3.text-align, etc. The cascade mechanism determines which of the multiple matching rules takes effect, based on source priority (developer style > user style > user agent style), importance (!important priority), specificity (ID > class/attribute selector > tag selector) and order (overrides defined after the same specificity
    CSS Tutorial . Web Front-end 355 2025-07-12 03:14:10
  • PHP prepared statement SELECT
    PHP prepared statement SELECT
    Execution of SELECT queries using PHP's preprocessing statements can effectively prevent SQL injection and improve security. 1. Preprocessing statements separate SQL structure from data, send templates first and then pass parameters to avoid malicious input tampering with SQL logic; 2. PDO and MySQLi extensions commonly used in PHP realize preprocessing, among which PDO supports multiple databases and unified syntax, suitable for newbies or projects that require portability; 3. MySQLi is specially designed for MySQL, with better performance but less flexibility; 4. When using it, you should select appropriate placeholders (such as? or named placeholders) and bind parameters through execute() to avoid manually splicing SQL; 5. Pay attention to processing errors and empty results to ensure the robustness of the code; 6. Close it in time after the query is completed.
    PHP Tutorial . Backend Development 601 2025-07-12 03:13:11
  • Applying CSS Filter effects to images and elements
    Applying CSS Filter effects to images and elements
    Yes,youcanapplyCSSfiltereffectstoimagesandelements.TheCSSfilterpropertyallowsapplyingvisualeffectslikeblur,brightness,contrast,grayscale,hue-rotate,opacity,saturate,andsepia,eitherindividuallyorcombined,usingsimplesyntaxsuchasfilter:brightness(50%);o
    CSS Tutorial . Web Front-end 490 2025-07-12 03:12:40

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