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

current location：Home > Technical Articles > Daily Programming > CSS Knowledge

  • How to set a fallback value for a CSS variable?
    How to set a fallback value for a CSS variable?
    The fallback value of the CSS variable is set through the second parameter of the var() function, which provides a default value when the variable is undefined or invalid. For example, in .box{background-color:var(--main-color,#cc);}, if --main-color is undefined or invalid, the background color will use #ccc. The fallback value is suitable for various CSS value types, such as length, keywords and nested variables, such as: 1. Default spacing padding:var(--spacing,1rem); 2. Font stack font-family:var(--heading-font,sans-serif); 3. Nested fallback
    CSS Tutorial . Web Front-end 911 2025-07-06 01:05:10
  • Using css outline property and its difference from border
    Using css outline property and its difference from border
    The outline attribute is very useful in improving web accessibility and debug layout, especially when users focus on elements. It will not affect the layout, usually be rectangular, only one element can have one, and the browser will be added to form controls by default; while border will take up space, can set rounded corners, support multi-layer borders, and need to be set manually. In actual use, it is recommended to retain or customize the focus style to ensure user experience.
    CSS Tutorial . Web Front-end 708 2025-07-06 01:02:21
  • Understanding CSS BEM methodology for naming conventions
    Understanding CSS BEM methodology for naming conventions
    BEM is a scalable and easy-to-maintain CSS organization method at the heart of improving code clarity through blocks, elements and modifier structures. 1. Block represents independent components such as .card; 2. Element is a component of the block such as .card__title; 3. Modifier is used to define variants such as .card--featured. This naming method improves team collaboration efficiency, avoids style conflicts, and enhances project scalability. When applying, you should pay attention to avoiding too deep nesting, ensuring that modifiers coexist with the underlying class, and maintaining naming consistency. Common errors include overuse of modifiers or mixing other naming specifications. Mastering BEM requires practice and discipline, but ultimately it can be revealed
    CSS Tutorial . Web Front-end 528 2025-07-06 00:31:00
  • When to use inline, block, or inline-block display in css
    When to use inline, block, or inline-block display in css
    The choice of inline, block, or inline-block depends on the element arrangement and layout requirements. 1. Use inline: Let the elements be integrated into the text stream, not occupy a single line, the width and height are invalid, suitable for the style changes in the text, such as; 2. Use block: The elements are independently blocked, and the width and height are full, and can set width and height and inner and outer margins, suitable for layout blocks such as navigation items and cards, such as display:block; 3. Use inline-block: has the flexibility of inline and the control of block, suitable for button groups, form alignment, and icon text combination, but it needs to deal with the problem of blank gaps between elements. It can be solved through HTML compact writing, font-size adjustment or negative margin.
    CSS Tutorial . Web Front-end 203 2025-07-06 00:28:50
  • Employing CSS pseudo-elements (`::before`, `::after`)
    Employing CSS pseudo-elements (`::before`, `::after`)
    Use CSS pseudo-elements (::before and ::after) to insert content and enhance visual effects without modifying HTML. 1. The basic usage is to add text or symbols through the content attribute, such as inserting red prompt text before the paragraph; 2. Common techniques include inserting quotes, arrows, icon fonts and implementing small triangles and other UI details; 3. You can use to match positioning and styles to achieve decorative effects, such as small triangles in the prompt box, button hovering effect, etc.; 4. It was used to clear floats, such as .clearfix::after to solve the floating collapse problem; 5. Notes include: the content must exist, the pseudo-element defaults to inline, and cannot be operated by JS, and is not suitable for placing important content, because of its influence.
    CSS Tutorial . Web Front-end 870 2025-07-06 00:05:01
  • Making an image responsive with css max-width
    Making an image responsive with css max-width
    In order to make the image adaptively displayed on different devices, the responsive style needs to be set. The core method is to use max-width and height:auto. 1. Set img{max-width:100%;height:auto;} to make the image automatically scale and maintain proportion according to the width of the parent container; 2.height:auto ensure that the height is adjusted proportionally to avoid deformation; 3. The parent container should use percentage, max-width or vw units to match the image response; 4. JavaScript alternatives are available for old IE, but modern projects generally do not need to be considered.
    CSS Tutorial . Web Front-end 323 2025-07-05 02:14:51
  • Using CSS nth-child and other structural pseudo-classes
    Using CSS nth-child and other structural pseudo-classes
    CSS structure pseudo-classes such as: nth-child() apply styles through the position of elements in the same level, and support formulas and keywords to select specific child elements. :nth-child(n) Select the nth child element based on the count of all child elements of the parent element. Formulas such as 2n 1 or even/odd can achieve the effects of table zebra patterns; while :nth-of-type() only calculates matching type elements. Common pseudo-classes include: first-child, : last-child, : only-child, etc., which are suitable for list, layout adjustment and other scenarios. Note: :nth-child() does not distinguish between tag types, but :nth-of-type() only takes effect for elements of the specified type; avoid replication
    CSS Tutorial . Web Front-end 559 2025-07-05 02:13:31
  • Using CSS pseudo-classes like `:last-child` or `:nth-child`
    Using CSS pseudo-classes like `:last-child` or `:nth-child`
    :last-child is used to select the last child element under the parent element, and the type must match. For example, li:last-child can remove the last li border; but if the last child element is not a specified type, it will not take effect. Recommended usage includes scenarios such as removing the last item border of the list, and the last item can be excluded by:not(:last-child). :nth-child(n) flexibly selects the nth child element. n can be a number, odd/even or an expression, such as tr:nth-child(even) sets the background color of the odd row of the table. Note: It is based on all child elements counts, non-similar elements are also counted in order, and n starts at 0. Common misunderstandings include structural changes
    CSS Tutorial . Web Front-end 952 2025-07-05 02:05:31
  • Mastering CSS Flexbox for complex layout alignment
    Mastering CSS Flexbox for complex layout alignment
    Flexbox simplifies the element alignment problem in complex layouts. Common applications include 1. Centering vertically and horizontally at the same time: setting display:flex, align-items:center, justify-content:center; 2. Handling unequal spacing: using gap attribute to control item spacing; 3. Align in different rows or columns: adjust child items individually through align-self or justify-self; 4. Special scenarios such as a single element facing the right or filling the remaining space can be achieved through margin-left:auto or flex-grow.
    CSS Tutorial . Web Front-end 958 2025-07-05 02:03:01
  • Understanding CSS Initial, Inherit, Unset, and Revert keywords
    Understanding CSS Initial, Inherit, Unset, and Revert keywords
    Initial, inherit, unset, and revert in CSS are four often overlooked but very useful keywords used to control style inheritance and reset. 1. Initial will restore the attribute to the initial value defined by the specification, such as color will turn black; 2. Inherit makes the element inherit the attribute value of the parent element, such as the child element's text color follows the parent; 3. unset will be inherited or initial respectively according to whether the attribute can be inherited, which is suitable for quickly clearing styles; 4. Revert will fall back the style to the browser or user default settings, which is often used to prevent style pollution. They are very useful in component development and style debugging.
    CSS Tutorial . Web Front-end 458 2025-07-05 02:02:40
  • What is the difference between align-self and align-items?
    What is the difference between align-self and align-items?
    align-items is used to set the default cross-axis alignment of all items in the entire flex container, while align-self is used to cover an item individually. 1.align-items is a container attribute, affecting all child elements. The default value is stretch. You can choose flex-start, flex-end, and center; 2.align-self is an attribute of individual child elements, which can override container settings and allow specific elements to adopt different alignment methods; 3. When using it, you should first set a unified control of align-items, and then adjust individual exceptions through align-self. Both must be effective in the parent container of display:flex.
    CSS Tutorial . Web Front-end 342 2025-07-05 02:01:20
  • How to chain multiple animations together?
    How to chain multiple animations together?
    To make multiple animations play in sequence, you can set delays through CSS's animation-delay to achieve simple concatenation; use JavaScript to listen for events or setTimeout for dynamic control; or use the timeline functions of animation libraries such as GSAP to arrange animations in order. 1. The CSS method realizes sequential playback by adding a delay value equal to the duration of the previous animation to the subsequent animation, which is suitable for simple scenes; 2. The JS method triggers the next animation by listening to the animationend event or using setTimeout, which is flexible and controllable but requires compatibility; 3. Animation libraries such as GSAP provide timeline functions, which can easily manage complex animation sequences and support intervals and overlapping effects; pay attention to delay calculation
    CSS Tutorial . Web Front-end 1004 2025-07-05 01:59:11
  • Comparing CSS Reset and CSS Normalize approaches
    Comparing CSS Reset and CSS Normalize approaches
    The main difference between CSSReset and CSSNormalize is that the strategies for handling browser default styles are different. CSSReset provides a blank starting point by removing all default styles, and commonly used global selectors such as * or body to clear margins, fills, etc.; while Normalize.css achieves cross-browser consistency through targeted repairs, retains useful default styles and corrects specific problems. Use CSSReset to suit highly customized design systems, prefer scenarios from scratch, or combine with tool-first frameworks such as TailwindCSS; while Normalize is more suitable for projects that value development efficiency and want to retain the advantages of browser default styles, especially for responsive websites and modern H needs
    CSS Tutorial . Web Front-end 482 2025-07-05 01:45:11
  • What does the position property do in CSS?
    What does the position property do in CSS?
    TheCSSpositionpropertycontrolselementplacementwithfivevalues:static,relative,absolute,fixed,andsticky.Staticisdefaultandfollowsdocumentflow.Relativeshiftsanelementfromitsnormalpositionwhilekeepingspaceintact.Absolutepositionsrelativetothenearestposit
    CSS Tutorial . Web Front-end 710 2025-07-05 01:43:50

Tool Recommendations

jQuery enterprise message form contact code

jQuery enterprise message form contact code is a simple and practical enterprise message form and contact us introduction page code.
form button
2024-02-29

HTML5 MP3 music box playback effects

HTML5 MP3 music box playback special effect is an mp3 music player based on HTML5 css3 to create cute music box emoticons and click the switch button.

HTML5 cool particle animation navigation menu special effects

HTML5 cool particle animation navigation menu special effect is a special effect that changes color when the navigation menu is hovered by the mouse.
Menu navigation
2024-02-29

jQuery visual form drag and drop editing code

jQuery visual form drag and drop editing code is a visual form based on jQuery and bootstrap framework.
form button
2024-02-29

Organic fruit and vegetable supplier web template Bootstrap5

An organic fruit and vegetable supplier web template-Bootstrap5
Bootstrap template
2023-02-03

Bootstrap3 multifunctional data information background management responsive web page template-Novus

Bootstrap3 multifunctional data information background management responsive web page template-Novus
backend template
2023-02-02

Real estate resource service platform web page template Bootstrap5

Real estate resource service platform web page template Bootstrap5
Bootstrap template
2023-02-02

Simple resume information web template Bootstrap4

Simple resume information web template Bootstrap4
Bootstrap template
2023-02-02

Cute summer elements vector material (EPS PNG)

This is a cute summer element vector material, including the sun, sun hat, coconut tree, bikini, airplane, watermelon, ice cream, ice cream, cold drink, swimming ring, flip-flops, pineapple, conch, shell, starfish, crab, Lemons, sunscreen, sunglasses, etc., the materials are provided in EPS and PNG formats, including JPG previews.
PNG material
2024-05-09

Four red 2023 graduation badges vector material (AI EPS PNG)

This is a red 2023 graduation badge vector material, four in total, available in AI, EPS and PNG formats, including JPG preview.
PNG material
2024-02-29

Singing bird and cart filled with flowers design spring banner vector material (AI EPS)

This is a spring banner vector material designed with singing birds and a cart full of flowers. It is available in AI and EPS formats, including JPG preview.
banner picture
2024-02-29

Golden graduation cap vector material (EPS PNG)

This is a golden graduation cap vector material, available in EPS and PNG formats, including JPG preview.
PNG material
2024-02-27

Home Decor Cleaning and Repair Service Company Website Template

Home Decoration Cleaning and Maintenance Service Company Website Template is a website template download suitable for promotional websites that provide home decoration, cleaning, maintenance and other service organizations. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-05-09

Fresh color personal resume guide page template

Fresh color matching personal job application resume guide page template is a personal job search resume work display guide page web template download suitable for fresh color matching style. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-29

Designer Creative Job Resume Web Template

Designer Creative Job Resume Web Template is a downloadable web template for personal job resume display suitable for various designer positions. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28

Modern engineering construction company website template

The modern engineering and construction company website template is a downloadable website template suitable for promotion of the engineering and construction service industry. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28