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  • How to select an element by its text content in CSS?
    How to select an element by its text content in CSS?
    ?Pure CSS cannot select elements based on text content, because the CSS standard does not support text content-based selectors such as: contains(); ? Classes or attributes should be used to accurately locate elements, which is a semantic and efficient approach; ? If you have to choose according to text, you can use JavaScript or jQuery to implement it; ?? Although modern browsers support the pseudo-class of: has(), it cannot directly match the plain text content and can only be indirectly matched through child elements or attributes. Therefore, the best practice is to reasonably use the principle of separation of HTML structure and style.
    CSS Tutorial . Web Front-end 812 2025-07-26 09:12:01
  • How to add a box shadow in CSS?
    How to add a box shadow in CSS?
    Use the box-shadow attribute to easily add shadows, and its syntax is box-shadow:offset-xoffset-yblur-radiusspread-radiuscolor; 1. In the basic usage, only the first two values need to be specified, the rest are optional; 2. Use the inset keyword to create inner shadows; 3. You can add multiple shadows by comma separation; it is recommended to use rgba() to achieve transparent effect. The larger the blur radius, the softer the shadow. The extended radius can expand or narrow the shadow range. The box-shadow does not affect the layout and is widely supported, but excessive use on animation elements should be avoided to maintain performance.
    CSS Tutorial . Web Front-end 202 2025-07-26 09:11:41
  • HTML `header` and `footer` Best Practices
    HTML `header` and `footer` Best Practices
    Header and footer tags are not only used for structural layout, but more importantly, they are improved semantics and accessibility. 1. The header usually places titles, navigation, etc., and the footer places copyright information, links, etc. to emphasize semantic value; 2. There can be multiple headers and footers on the page, and each block such as article can be used independently; 3. Avoid error nesting or semantic confusion, such as footer should not be nested in the header; 4. Combining ARIA attributes such as role="banner" and role="contentinfo" can enhance the barrier-free experience.
    HTML Tutorial . Web Front-end 690 2025-07-26 09:08:00
  • What are CSS container queries?
    What are CSS container queries?
    CSScontainerqueriesallowstylingelementsbasedontheircontainer'ssize.1.Containerqueriesworkbydefiningacontainerwithcontainer-type,thenusing@containerrulestoapplystylesbasedonthatcontainer'sdimensions.2.Developerscanalsonamecontainerswithcontainer-namef
    CSS Tutorial . Web Front-end 246 2025-07-26 09:06:01
  • How to style a dropdown?
    How to style a dropdown?
    Tostyleanativedropdown,useCSSpropertieslikepadding,border-radius,andappearance:nonetoremovedefaultstyling,whileaddingacustomarrowviabackground-imageandensuringaccessibilityandcross-browsercompatibility.2.Forfullcontrol,createacustomdropdownwithHTML,C
    CSS Tutorial . Web Front-end 714 2025-07-26 09:03:20
  • css flexbox wrap example
    css flexbox wrap example
    Flex-wrap attribute is used to control whether child elements in the Flex container will be wrapped when there is insufficient space. Its commonly used values are nowrap (there is no line wrapping by default), wrap (the line wrap is allowed, the next line is below), and wrap-reverse (the line wrap is allowed, the next line is above); in the responsive card layout example, automatic line wrapping is achieved by setting flex-wrap:wrap, combined with flex:00calc (33.33%-16px) to ensure that each line displays up to 3 fixed-width cards and subtracts the spacing. Use the gap attribute to uniformly control the distance between cards, and then adjust the flex-basis to calc (50%-16px) (2 per line) under the small screen through media query and adjust the flex-basis to calc (50%-16px) (2 per line) and
    CSS Tutorial . Web Front-end 878 2025-07-26 08:58:51
  • How to add CSS to HTML?
    How to add CSS to HTML?
    InlineCSSappliesstylesdirectlytoHTMLelementsusingthestyleattributeandisbestforquick,uniquestylingofasingleelement.2.InternalCSSusesataginthesectionandissuitableforstylingasinglewebpagewithoutcreatingaseparatefile.3.ExternalCSSinvolveslinkingaseparate
    CSS Tutorial . Web Front-end 955 2025-07-26 08:54:15
  • HTML for Building Print-Friendly Web Pages
    HTML for Building Print-Friendly Web Pages
    To make web pages print well, you need to design targeted printing styles. 1. Use @mediaprint to define special styles, hide irrelevant elements such as navigation bars and advertisements, and adjust the font size and color; 2. Control the paging behavior and avoid content breakage through attributes such as page-break-inside and page-break-after; 3. Simplify the layout, remove dynamic elements and display the link URL; 4. Test the preview function through the browser and optimize the effect to ensure that the final output is clear and easy to read.
    HTML Tutorial . Web Front-end 312 2025-07-26 08:51:01
  • How to create a responsive table?
    How to create a responsive table?
    Use semantic HTML to create basic tables; 2. Use responsive CSS technology: Option A sets horizontal scrolling through containers, suitable for tables with moderate columns; Option B stacks tables into a card-style layout through media queries under a small screen, and adds data-label attributes to improve readability; Option C uses Flexbox or Grid to simulate tables, with high flexibility but attention to accessibility; 3. Avoid fixed width, use relative units, test real devices and ensure barrier-free support; the best solution depends on data and user needs. Option A is recommended in most cases, and option B is selected for mobile priority. All methods need to be kept concise and tested as early as possible to ensure cross-device readability and usability.
    CSS Tutorial . Web Front-end 425 2025-07-26 08:47:01
  • The HTML `source` Element for Multimedia
    The HTML `source` Element for Multimedia
    The source element is used to provide multiple media resources for audio or video in web development, helping the browser to automatically select the most suitable source based on device capabilities, format support and responsive needs. 1. It is mainly used to specify media file paths and types in different formats within the tag to achieve cross-browser compatibility; 2. The type attribute defines MIME types and codecs, such as video/mp4 or video/webm, to improve loading efficiency; 3. Combining media attributes can realize responsive design, loading the adapted video resolution according to different screen widths; 4. When using it, pay attention to the order, add alternate prompt content, test multi-browser compatibility, and consider preloading strategies to optimize performance.
    HTML Tutorial . Web Front-end 492 2025-07-26 08:46:01
  • What is the placeholder attribute in an input field?
    What is the placeholder attribute in an input field?
    Theplaceholderattributeprovidesabriefhintinaninputfieldtoguideusersonexpectedinput,suchas;itdisplayslighttextthatdisappearswhentheuserfocusesonortypesinthefield.1.Itisnotasubstitutefortheelementandshouldalwaysbeusedalongsidealabelforaccessibility.2.T
    HTML Tutorial . Web Front-end 817 2025-07-26 08:44:21
  • css font-variant-numeric example
    css font-variant-numeric example
    font-variant-numeric is used to control the display style of numbers, fractions and serial numbers. 1. Tabular-nums realize monospace numeral alignment; 2. Lining-nums set contour numerals; 3. Oldstyle-nums use old-style numerals; 4. Proportional-nums enable proportional width; 5. slashed-zero distinguish zero from O; 6. Ordinal beautify serial numbers such as 1??; 7. Fraction optimizes fraction display such as ?; combined use can improve the readability and professionalism of tables, prices, and statistics. It needs to be matched with fonts that support OpenType characteristics and apply them in modern browsers. The final effect is fully presented and arranged.
    CSS Tutorial . Web Front-end 134 2025-07-26 08:42:41
  • css counters example
    css counters example
    CSS counters realize automatic numbering through counter-reset, counter-increment and counter(). 1. Define counter-reset:section in .document to implement h2 numbering; 2. Reset child counters with counter-reset:subsection for each h2; 3. h3 and h4 respectively increment through counter-increment and insert hierarchical numbering with ::before; 4. Use counters(item,".") to automatically process the number of multi-layer nested lists, and finally generate such as 1., 2.1, 3.1.1, etc.
    CSS Tutorial . Web Front-end 760 2025-07-26 08:42:01
  • css aspect-ratio property example
    css aspect-ratio property example
    Theaspect-ratioCSSpropertyenablesconsistentwidth-to-heightratiosforelements.1.Itallowscontainerstomaintainproportionslike16:9or1:1withoutJavaScript.2.Inaresponsivevideoexample,thecontainerscalessmoothlywhileautomaticallyadjustingheightbasedonwidth.3.
    CSS Tutorial . Web Front-end 833 2025-07-26 08:35:20

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