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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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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