05 Jul 2025

The method to use loading="lazy" to achieve lazy loading is to add this attribute to the tag, which is natively handled by the browser; its advantages include reducing the initial load of the page, improving performance, and being more conducive to SEO and barrier-free access; when using it, you should avoid lazy loading of the first-screen image. It is recommended to use placeholders to prevent layout jitter, ensure the correct image format, and pay attention to the compatibility of third-party components.

04 Jul 2025

Loading the image to HTML5Canvas requires waiting for the image to load. You can perform drawing operations through the img.onload callback; use the drawImage method to draw a complete image, scale the image or capture a partial image; after drawing, you can use getImageData to obtain pixel data and write back the modified content with putImageData. The specific steps are: 1. Create Image object and set src; 2. Call drawImage in the onload callback to draw the image; 3. Use different parameters of drawImage to achieve image drawing, scaling and cropping; 4. Get the pixel array through getImageData for processing; 5. Use putImag after the processing is completed

07 Jul 2025

How to implement lazy loading of images and iframes in HTML5? By adding loading="lazy" attribute to the and tags, the browser delays loading these elements until they are about to enter the viewport. Applicable scenarios include non-first-screen content at the bottom of the page, gallery or product pages with a large number of pictures, content skipped by mobile terminals in responsive design, and pages with multiple iframes embedded. It is not recommended to use lazy loading for key content on the home screen such as logo or banner. Notes include: 1. When it is compatible with old browsers, you must introduce polyfill; 2. Ensure that the search engine can recognize the image content to avoid SEO influence; 3. Set placeholders to prevent layout jitter; 4. Dynamically inserted pictures need to be manually processed and lazy loaded.

15 Sep 2025

Useloading="lazy"intagstodeferoffscreenimageloading,improvingperformanceandsavingbandwidthinmodernbrowsers.2.SetexplicitwidthandheightattributeswithCSSaspectratiopreservationtopreventlayoutshifts.3.Forolderbrowsers,combinewithJavaScriptsolu

11 Aug 2025

This document is intended to guide developers on how to use the Glide library to load SVG images in Android applications. The content covers Glide configuration, integration of SVG support modules, sample code for loading SVG images, and solutions to common problems to help developers successfully load and display SVG images.

14 Sep 2025

Answer: Loading animations through HTML, CSS and JavaScript. First create a div container, use CSS to define rotation styles and animations, and then use JavaScript to monitor page loading events, dynamically control the display and hiding of animations, and improve the user's waiting experience.

29 Aug 2025

This tutorial details how to dynamically obtain SVG content through URLs in JavaScript and modify its internal elements in real time. The text content of SVG is obtained through the fetch API, and then parsed and temporarily injected into the DOM, thereby achieving precise access and modification of SVG paths, colors and other attributes. This approach is especially suitable for scenarios where SVG appearance needs to be dynamically adjusted according to user interaction or data changes.

06 Apr 2025

Methods to optimize HTML5 video loading speed: Use modern video codecs (such as VP9, ??H.265) to compress files. Implement an adaptive bitrate video stream to adjust video quality. Download videos in chunks to download in parallel. The video is delayed and does not start loading until the user scrolls. How to adapt HTML5 video on mobile: Ensure that the video codec is compatible with the device. Resize the video container to fit the screen. Select a lower bit rate to reduce buffering. Use responsive design techniques to adjust the layout. Optimize video controls and players to suit touch screen devices.

28 Nov 2024

Async vs. Defer: Optimizing Script Loading in HTML5Understanding Async and DeferThe async and defer attributes provide mechanisms to control the...