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  • Can you use media queries to check for device orientation (portrait/landscape)?
    Can you use media queries to check for device orientation (portrait/landscape)?
    Yes, you can use CSS media to query the direction of the device; 1. Use @mediascreenand(orientation:portrait) to detect the vertical screen, which is suitable for adjusting the button size and hiding non-key content; 2. Use @mediascreenand(orientation:landscape) to detect the horizontal screen, which is suitable for displaying horizontal content, changing the layout of the navigation bar, etc.; 3. Note that the orientation reflects the viewport width and height relationship rather than the physical direction, and the behavior of different devices may be inconsistent, so compatibility testing is recommended; 4. You can also use min-aspect-ratio or max-aspect-ratio to determine the actual situation.
    CSS Tutorial . Web Front-end 496 2025-07-03 01:25:30
  • How to use the new :has() relational pseudo-class in CSS Selectors?
    How to use the new :has() relational pseudo-class in CSS Selectors?
    :has() is a new relational pseudo-class added by CSS, allowing the parent element to be selected based on whether the child element exists. The basic usage is parent:has(child){style}, such as p:has(img) will select the paragraph containing the image and apply the style. Practical scenarios include: 1. Automatically adjust the style, such as adding an inner margin to the div containing links; 2. Exact match, such as adding an icon to the paragraph containing external links; 3. Structural style control can be achieved without class or JS. Notes include: 1. Mainstream browsers have supported but Firefox has not been followed up yet; 2. Nested use is not supported: has(:has(...)); 3. The selector should be kept concise to avoid performance problems. Alternatives include adding class manually
    CSS Tutorial . Web Front-end 144 2025-07-03 01:25:00
  • Understanding CSS selectors tutorial
    Understanding CSS selectors tutorial
    CSS selector is a key tool for precise control of web elements in front-end development. 1. The basic selector includes element selectors (such as p), class selectors (such as .btn) and ID selectors (such as #header), which are used to match tags, reusable class names and unique IDs, respectively, and the difference is priority and usage scenarios; 2. Combination selectors achieve more precise selection through descendants (such as divp), offspring (such as ul>li), adjacent brothers (such as h1 p) and general brothers (such as h1~p) relationships; 3. Attribute selectors select elements based on attribute values, such as [type="text"], [href] and [class*="col-"]
    CSS Tutorial . Web Front-end 311 2025-07-03 01:22:30
  • What is the purpose of the :is() and :where() pseudo-classes in CSS Selectors?
    What is the purpose of the :is() and :where() pseudo-classes in CSS Selectors?
    :is() and :where() are used to simplify CSS selectors, the difference is that the former affects specificity, while the latter does not. :is() reduces duplicate code by combining multiple selectors, such as ::is(h1,h2,h3,p,li)a:hover matches any link that meets the criteria and adopts the highest internal specificity; while :where() also combines selectors but does not increase specificity, which is suitable for resetting styles or avoiding conflicts, such as ::where(.highlight,.feature) background color setting will not override other rules. Common uses of the two include theme switching, component style grouping and low specific global reset to improve code maintainability and scalability.
    CSS Tutorial . Web Front-end 507 2025-07-03 01:00:22
  • A complete CSS tutorial on styling HTML tables
    A complete CSS tutorial on styling HTML tables
    HowcanHTMLtablesbeeffectivelystyledwithCSS?1.Startbyapplyingbasestyleslikeborder-collapse,padding,andbackgroundcolorstoheadersforacleanlayout.2.Enhancereadabilitywithzebrastripesusing:nth-child(even)andaddhovereffectsforinteractivity.3.Controlborders
    CSS Tutorial . Web Front-end 774 2025-07-03 00:44:20
  • Can you combine the :not() pseudo-class with other CSS Selectors?
    Can you combine the :not() pseudo-class with other CSS Selectors?
    Yes, :not() can be used in conjunction with other CSS selectors. 1. You can combine :not() with the class. For example, a:not(.btn) can select links to non-.btn classes; 2. You can implement multiple exclusion conditions through comma separation, such as input:not([type="text"],[type="email"]) to exclude text and mailbox input boxes; 3. You can combine with pseudo-classes, such as li:not(:first-child) to add styles to all list items except the first one. At the same time, you need to note that their internal selectors affect specificity and cannot be nested.
    CSS Tutorial . Web Front-end 939 2025-07-03 00:39:20
  • How do you use the logical properties and values (e.g., margin-inline-start)?
    How do you use the logical properties and values (e.g., margin-inline-start)?
    Logicalpropertieslikemargin-inline-startshouldbeusedwhendesigninglayoutsthatadapttodifferentwritingsystemsorRTLlanguages.1.Theydefinespacingbasedoncontentflowratherthanfixeddirections.2.margin-inline-startadjustsautomaticallydependingonthetextdirecti
    CSS Tutorial . Web Front-end 454 2025-07-03 00:33:40
  • What are attribute selectors and can you provide an example?
    What are attribute selectors and can you provide an example?
    The CSS attribute selector performs precise style control through the attributes and values ??of elements, and supports multiple matching methods. Its basic syntax is element[attribute="value"], for example: [type="text"] exactly matches attribute values; [href] only judges the existence of attributes; [class~="highlight"] matches specific values ??in the space-separated class name list; [attr|=value] is used to match hyphen-separated values ??(such as language code); [attr^=value], [attr$=value] and [attr*=value] respectively
    CSS Tutorial . Web Front-end 375 2025-07-03 00:32:30
  • The Gap Strikes Back: Now Stylable
    The Gap Strikes Back: Now Stylable
    Styling the space between layout items — the gap — has typically required some clever workarounds. But a new CSS feature changes all that with just a few simple CSS properties that make it easy, yet also flexible, to display styled separators between
    CSS Tutorial . Web Front-end 368 2025-07-02 09:21:15
  • When should you choose Flexbox over CSS Grid for a layout?
    When should you choose Flexbox over CSS Grid for a layout?
    Flexbox should be selected for one-dimensional layout, such as navigation bar, responsive components, and vertical centering; use CSSGrid to handle two-dimensional layouts. 1. Flexbox is suitable for horizontal or vertical arrangement of elements, such as link alignment and spacing control in the navigation bar; 2. When building responsive components (such as buttons and form controls), Flexbox provides more intuitive layout adjustments; 3. Flexbox simplifies the vertical centering problem, which can be achieved through align-items and justify-content. For complex layouts that require both rows and columns to be managed simultaneously, CSSGrid should be selected.
    CSS Tutorial . Web Front-end 463 2025-07-02 01:21:51
  • What are named grid lines?
    What are named grid lines?
    NamedgridlinesinCSSGridLayoutallowyoutoassigncustomnamestorowandcolumnlines,improvingreadabilityandmaintainability.1.Theyenhanceclaritybyusingmeaningfulnameslike"sidebar-start"insteadofnumbers.2.Theyofferflexibilitybylettingyoudefinemultipl
    CSS Tutorial . Web Front-end 589 2025-07-02 01:19:40
  • How to create an intrinsically responsive grid layout?
    How to create an intrinsically responsive grid layout?
    To create an intrinsic responsive grid layout, the core method is to use CSSGrid's repeat(auto-fit,minmax()) mode; 1. Set grid-template-columns:repeat(auto-fit,minmax(200px,1fr)) to let the browser automatically adjust the number of columns and limit the minimum and maximum widths of each column; 2. Use gap to control grid spacing; 3. The container should be set to relative units such as width:100%, and use box-sizing:border-box to avoid width calculation errors and center them with margin:auto; 4. Optionally set the row height and content alignment to improve visual consistency, such as row
    CSS Tutorial . Web Front-end 299 2025-07-02 01:19:20
  • What is Autoprefixer and how does it work?
    What is Autoprefixer and how does it work?
    Autoprefixer is a tool that automatically adds vendor prefixes to CSS attributes based on the target browser scope. 1. It solves the problem of manually maintaining prefixes with errors; 2. Work through the PostCSS plug-in form, parse CSS, analyze attributes that need to be prefixed, and generate code according to configuration; 3. The usage steps include installing plug-ins, setting browserslist, and enabling them in the build process; 4. Notes include not manually adding prefixes, keeping configuration updates, prefixes not all attributes, and it is recommended to use them with the preprocessor.
    CSS Tutorial . Web Front-end 218 2025-07-02 01:15:21
  • How do you clear a float?
    How do you clear a float?
    There are two main ways to clear the impact of floating: use the clear attribute or the clearfix technique. 1. When using the clear attribute, set clear:both on the element that needs to be disconnected to make the element appear below the floating element, but additional tags will be introduced; 2. Clearfix tricks to clear the floating hook through pseudo-element::after insertion, no additional DOM nodes are required and highly reusable, suitable for modular development; in addition, modern layouts can consider Flex or Grid to replace float to avoid floating problems.
    CSS Tutorial . Web Front-end 1012 2025-07-02 01:14:51

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