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- What is Web Storage API in HTML5 (localStorage and sessionStorage)?
- WebStorageAPI provides two ways for clients to store data: localStorage and sessionStorage. localStorage is used to store data permanently, and will not be lost even if the browser is closed. It is suitable for saving user preferences, topic settings and other information; sessionStorage is only valid during the current session and is cleared after closing the page or tag. It is suitable for temporary data such as temporary storage of forms. Both support setItem(), getItem(), removeItem() and clear() methods to operate data, but the stored data must be in string format, and the object or array must be converted through JSON.stringify().
- HTML Tutorial . Web Front-end 308 2025-07-07 02:22:31
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- What is the difference between link rel prefetch and preload in html?
- rel="preload" is used for the high priority resources that are much needed on the current page, while rel="prefetch" is used for the low priority resources that may be needed in the future. 1.rel="preload" tells the browser to download key resources such as fonts, scripts or style sheets immediately to improve the rendering speed of the current page; 2.rel="prefetch" serves as a prompt to allow the browser to download resources that may be used in subsequent navigation when it is idle, such as CSS or JS files on the next page. Both are designed to optimize load performance, but are applicable in different scenarios, and incorrect use can lead to bandwidth waste or performance degradation.
- HTML Tutorial . Web Front-end 422 2025-07-07 02:22:11
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- What are the different input types in an HTML form
- There are 8 common input types in HTML forms, which are suitable for different data input requirements. 1.text is used for basic text input; 2.password is used to hide the password input displayed; 3.email is used to input email addresses specifically; 4.number is used for digital input and supports adjustment of numerical values; 5.checkbox is used for multiple selection check boxes; 6.radio is used for single-select button groups; 7.date provides date selection function; 8.submit is used to submit form data. Each type has its own specific uses and browser support features. Regular use can improve user experience and data processing efficiency.
- HTML Tutorial . Web Front-end 927 2025-07-07 02:16:42
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- How to use HTML data attributes (data-*) with JavaScript?
- How to set and use HTML data-properties? 1. Add data-attribute to HTML elements, with the format data-added a custom name, such as data-product-id; 2. Use element.dataset to obtain the value through JavaScript, and the attribute name will automatically be converted to camel naming; 3. You can modify or add data-values ??by directly assigning datasets, but the modification will not be automatically persisted; 4. Common uses include storing IDs, controlling status, and passing component parameters. For example, the button's data-property uniformly monitors click events and handles filtering logic, making the code clearer and easier to expand.
- HTML Tutorial . Web Front-end 445 2025-07-07 02:16:21
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- What is the HTML template tag?
- Tags are containers used in HTML5 to store lazy content. They are not directly rendered when the page is loaded, but can be dynamically extracted and used through JavaScript. It is suitable for scenes where the same structure needs to be created repeatedly, such as generating lists, cards, or pop-ups. 1. The UI component structure can be predefined to improve component development efficiency; 2. Reduce the amount of code used by JS to splice HTML to enhance maintainability; 3. Improve page performance, because the template does not participate in rendering at the beginning. The steps to use include: define the template structure in HTML, obtain and clone its contents in JavaScript, and insert the DOM after modification. Notes include: only effective in modern browsers, avoid directly embedding scripts or styles, and it is recommended to add class names or IDs for operation in complex structures.
- HTML Tutorial . Web Front-end 857 2025-07-07 02:01:52
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- Where to start learning HTML for free?
- TolearnHTMLforfree,startwithinteractiveplatformslikefreeCodeCamp,W3Schools,Codecademy,andTheOdinProjectforstructuredlessons.UseMDNWebDocsasareliablereferencefortagsandbestpractices.PracticebybuildingsimplepagessuchasanAboutMeorresumesiteusingonlyHTML
- HTML Tutorial . Web Front-end 246 2025-07-07 02:01:12
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- How to use the and tags to create an accordion in HTML?
- Yes,youcancreateasimpleaccordionusingonlytheandtagsinHTMLwithoutJavaScript.1.Usethetagtowrapeachsection'scontent.2.Placeataginsideastheclickableheading.3.StylewithCSSforborders,spacing,andiconcustomization.4.Includemultipleblocksformulti-sectionaccor
- HTML Tutorial . Web Front-end 1001 2025-07-07 02:00:52
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- How to create a full-screen landing page with HTML and CSS?
- To create a full-screen landing page, you need to use HTML and CSS to combine viewport units and layout techniques. 1. Set the HTML structure and include viewport meta tags to adapt to mobile devices; 2. Use height:100vh to make the container occupy the full viewport height; 3. Use Flexbox to achieve vertical and horizontal centering of the content; 4. Use background-size:cover and background-position:center to ensure responsive display when adding background images; 5. Optimize the scrolling experience through scroll-behavior or JavaScript to ensure normal display and smooth interaction.
- HTML Tutorial . Web Front-end 903 2025-07-07 01:56:02
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- How to make form input fields mandatory using html attributes?
- The most direct way to make the input box in the HTML form required is to use the required property. This property is a Boolean type, and no value is required. It can be used to verify it on the input, select or textarea tags, such as:; Common matching types include text, email, password, etc.; for checkbox, directly add required to force check; in the radio button group, just add required to the first option; the select drop-down box needs to set the default empty value option to trigger verification; different browsers may have different styles and contents of prompt information. If a unified prompt effect is required, you can customize it with JavaScript or third-party libraries for customization.
- HTML Tutorial . Web Front-end 766 2025-07-07 01:50:31
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- What is the HTML DOM (Document Object Model)
- DOM is a structured object model that the browser parses HTML files into. Through a tree structure, JavaScript can dynamically manipulate page content, structure and style. It corresponds to HTML tags in the form of nodes, such as element nodes and text nodes. JavaScript implements interactive operations through the API provided by DOM, such as: 1. Get elements (such as document.getElementById); 2. Modify content (such as textContent); 3. Add or delete nodes (such as createElement and appendChild); 4. Listen to events (such as clicks and inputs). The dynamic nature of DOM enables web pages to respond to user behavior in real time, and is the core of front-end development.
- HTML Tutorial . Web Front-end 747 2025-07-07 01:49:01
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- How to create ordered and unordered lists in HTML
- The methods of creating ordered lists and unordered lists in HTML are as follows: 1. Use tags to create ordered lists, suitable for content with order or priority, as described in the step, numbered by default; 2. Use tags to create unordered lists, suitable for content with parallel unordered content, such as navigation menus, marked with dots by default; 3. Lists can be used in nested, and are often used for directory navigation by inserting new or multi-level structures in them. Each list item must be wrapped in a tag, and combined with CSS can achieve rich styles and layouts.
- HTML Tutorial . Web Front-end 388 2025-07-07 01:27:31
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- How does the html document outline algorithm work with sectioning elements?
- ThekeysectioningelementsinHTMLthatcontributetothedocumentoutlineare,,,and;eachcreatesanewsectionorsubsectionintheoutlinewhenusedwithheadings.1)Theoutlinealgorithmusesnestingoftheseelementstodeterminehierarchy,notheadinglevels—aheadinginsideasectionde
- HTML Tutorial . Web Front-end 141 2025-07-07 01:09:32
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- How to add icons (like Font Awesome) to an HTML page?
- To add FontAwesome icon to an HTML page, first introduce resources through CDN. The method is to add 1. Find the desired icon and copy its HTML code before or, for example; 2. The icon is often used to enhance visual recognition, such as saving, 3. You can resize fa-lg and fa-2x and control the color with CSS; 4. If you need to deploy locally, you can download and configure it manually, but in most cases, CDN is recommended.
- HTML Tutorial . Web Front-end 986 2025-07-07 00:52:51
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- How to validate the syntax and structure of an html file?
- Verifying HTML files allows you to ensure syntax specifications through online tools, local integration tools, and manual inspection. 1. Use W3CMarkupValidationService and other online tools to quickly detect errors and locate line numbers; 2. Install HTMLHint, SublimeLinter and other plug-ins in VSCode or SublimeText to achieve real-time verification during writing; 3. Manually check whether the basic structure is complete, such as whether , , is correctly nested, whether the tag is closed, and whether the attribute value is quoted; 4. Pay attention to the ID uniqueness, block-level and inline element nesting rules, and DOCTYPE declarations, etc., to avoid layout exceptions and browser compatibility issues.
- HTML Tutorial . Web Front-end 789 2025-07-07 00:49:32
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