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- How to specify character encoding for an HTML document?
- The way to specify the character encoding of an HTML document is to use a tag. To ensure that the web page displays Chinese and special symbols correctly, it is recommended to use UTF-8 encoding uniformly. 1. Declaring the character set in HTML should use the concise method recommended by HTML5: and put it at the beginning of the part; 2. When saving the file, you must select UTF-8 format to avoid the editor saving it as other encoding by default; 3. The server needs to configure the response header to specify the character set, such as Apache adds AddDefaultCharsetUTF-8, and Nginx configures charsetutf-8. These three aspects can avoid the problem of garbled code.
- HTML Tutorial . Web Front-end 956 2025-07-09 02:23:41
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- What is the html canvas element used for?
- Elements of HTML are used to render graphics on web pages through JavaScript. They do not have the ability to display shapes or images themselves and must be drawn through scripts. 1. It supports drawing basic shapes such as rectangles, circles and lines. Common methods include fillingRect() filling rectangles, strokeRect() stroke rectangles and clearRect() clear areas; 2. It can render images and text, use drawImage() to place images, fillText() to draw text; 3. It is suitable for animation and real-time graphics, and the animation effect is achieved through repeated clearing and redrawing, and can be optimized with requestAnimationFrame(); 4. The disadvantage is that the content is inaccessible and unsuitable.
- HTML Tutorial . Web Front-end 968 2025-07-09 01:59:52
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- What is the tabindex attribute and how does it affect focus order?
- Thetabindexattributecontrolselementfocusbehavior.Negativevalues(e.g.,-1)allowprogrammaticfocusbutexcludefromtabbing,zero(0)includestheelementinthenaturaltaborder,andpositivevaluesdefineacustomtaborderbutshouldbeavoidedunlessnecessary.Usetabindex=&quo
- HTML Tutorial . Web Front-end 825 2025-07-09 01:54:21
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- What is the purpose of the figure and figcaption elements?
- It is a semantic tag used to wrap independent media content, such as pictures, charts, videos, etc., indicating that the content can be self-contained; it is provided with explanatory text to enhance accessibility and contextual understanding. 1. As a container, improve structural clarity and semantic expression; 2. Place it inside as title, description or source information; 3. When using it, you should pay attention to non-decorative and non-embedded content to apply, and the alt attribute must still be retained to ensure accessibility.
- HTML Tutorial . Web Front-end 1003 2025-07-09 01:51:32
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- What is the purpose and usage of the html template element?
- The HTML element is used to store HTML structures that are not rendered immediately. It is cloned through JavaScript and inserted into the page to achieve reuse and dynamic update of content. The advantage is to keep the page clean and avoid flickering of unreleased content; it is often found in duplicate UI components, dynamic page updates and template localization management. Specific usage steps: 1. Define the template tag with id; 2. Cloning the content with document.importNode; 3. Modifying the cloned node data; 4. Insert it into the DOM. Notes include avoiding ID conflicts, using class selectors, deep copy nodes, and placing template locations reasonably. In addition, the scripts in the template will not be executed automatically. You need to manually touch the page after inserting it.
- HTML Tutorial . Web Front-end 585 2025-07-09 01:48:42
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- How to create custom elements with HTML?
- Custom HTML elements achieve component development by inheriting HTMLElement and registering. 1. Define the class to inherit HTMLElement, use constructor and lifecycle methods such as connectedCallback to control element behavior; 2. Register elements through customElements.define(), and the tag name must contain short horizontal lines; 3. Use custom tags directly in HTML; 4. Add observedAttributes and attributeChangedCallback to implement attribute listening and interactive updates.
- HTML Tutorial . Web Front-end 170 2025-07-09 01:44:21
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- How to make a responsive iframe?
- To make iframes responsive, the core is to use CSS to control the aspect ratio and combine it with the wrapping container to achieve adaptation. 1. Use padding techniques to create container boxes with fixed proportions. Common ratios such as 16:9 correspond to padding-top56.25%, 4:3 correspond to 75%, and 1:1 correspond to 100%; 2. Set the iframe width to 100% and use absolute positioning to fill the container, or use the aspect-ratio attribute to maintain the proportion; 3. When processing third-party embedded content, control the ratio through container wrapping, and ensure that the allowfullscreen attribute is added to support full-screen playback on mobile terminals. Master the container and proportion settings to realize the responsiveness of the iframe
- HTML Tutorial . Web Front-end 429 2025-07-09 01:39:01
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- How to use the srcset and sizes attributes for responsive images?
- srcset and sizes are key properties used in HTML for responsive images. 1.srcset provides multiple image versions for the browser to choose, such as pictures of different widths or pixel density; 2.sizes tells the browser the display width of the picture under different screen conditions, helping the browser to select the most suitable image resource based on the viewport size and device pixel ratio; 3. When using it, you should prepare multiple sizes of pictures, clearly named, test device behavior, pay attention to performance trade-offs, and retain fallback's src pictures to ensure compatibility and default display effect.
- HTML Tutorial . Web Front-end 440 2025-07-09 01:36:42
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- What is the HTML Imports specification (and why was it deprecated)?
- HTMLImports is a deprecated modular loading mechanism that allows the use of its content in the current page by introducing external HTML files. 1. It was used to encapsulate component structures, styles and behaviors for reuse; 2. It was eliminated due to synchronous loading impacts performance, lack of module system support, inconsistent with the development direction of modern WebComponents, and the mainstream framework's shift to JS modularity; 3. Alternatives include using ESModules to define components in combination with ShadowDOM and CustomElements, or using the help of building tools to manage templates and component structures.
- HTML Tutorial . Web Front-end 843 2025-07-09 01:24:11
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- What are ARIA landmark roles (e.g., role='navigation')?
- ARIAlandmarkroleshelpscreenreaderusersnavigatewebpagesectionsefficiently.1.Role="navigation"marksmenusorlinks,bestusedonelements.2.Role="main"identifiesprimarycontent,ideallyonceperpage.3.Role="search"definessearchforms,
- HTML Tutorial . Web Front-end 401 2025-07-09 01:23:11
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- How to handle forms submission in HTML without a server?
- When there is no backend server, HTML form submission can still be processed through front-end technology or third-party services. Specific methods include: 1. Use JavaScript to intercept form submissions to achieve input verification and user feedback, but the data will not be persisted; 2. Use third-party serverless form services such as Formspree to collect data and provide email notification and redirection functions; 3. Use localStorage to store temporary client data, which is suitable for saving user preferences or managing single-page application status, but is not suitable for long-term storage of sensitive information.
- HTML Tutorial . Web Front-end 211 2025-07-09 01:14:32
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- How to make an HTML responsive?
- The key to achieving a built-in responsive layout is to avoid fixed widths and utilize container scale. The easiest way is to set the iframe width to 100% and use the aspect-ratio attribute to control the aspect ratio, such as iframe{width:100%; aspect-ratio:16/9;}, which is suitable for modern browsers and video embedding scenarios; if IE compatible, you can use the outer div container to match the padding-top technique to achieve responsiveness by setting .iframe-container{position:relative;width:100%;padding-top:56.25%;} and absolute positioning of iframes;
- HTML Tutorial . Web Front-end 193 2025-07-09 00:57:41
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- How to embed a PDF document in an HTML page?
- To embed PDF files in web pages, the most common method is to use HTML or tags, or to use third-party services such as GoogleDocs to achieve more friendly display. 1. Use tags to quickly and directly embed PDFs. The syntax is the advantage of simple writing and good compatibility, but limited style control; 2. Use tags to provide more custom space and add alternate content. The syntax is that your browser does not support PDF preview. Please download this file. The advantage is that it provides download links to improve user experience when it does not support PDF display; 3. With the help of GoogleDocs, online viewers can be realized through iframes. The syntax is that you need to pay attention to URL encoding and network access rights issues. It is recommended for mobile adaptation, and supports zooming and page turning operations. also
- HTML Tutorial . Web Front-end 184 2025-07-09 00:55:01
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- What is the oninput event and how is it different from onchange?
- Oninput triggers real-time feedback when user inputs, and onchange triggers when the value changes after losing focus. oninput is used for real-time verification, search and filtering, and other scenarios that require immediate response, while onchange is suitable for scenarios that pay attention to the final value, such as saving settings or submitting data; performance issues should be paid attention to when using oninput, and can be optimized through anti-shake and other methods.
- HTML Tutorial . Web Front-end 936 2025-07-09 00:30:42
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