viewport:
You can define the width of the viewport. If you do not use width=device-width, your page will extend beyond the viewport layout on the mobile terminal. Width (width=980px), if you use width=device-width, your page will be displayed with the appropriate mobile width (width=320px), we can use meta tags:
viewport - target-densitydpi
Before talking about this attribute, let’s talk about pixel-px. Taking the computer desktop as an example, under the same monitor, there is no need to display it at different resolutions. At high resolution, desktop icons will be displayed smaller, and at low resolution The icon will be displayed larger at lower speed.
Android introduces target-densitydpi. When setting target-densitydpi=device-dpi, on the same large mobile phone screen, pictures and text will be displayed on high-resolution devices. It will be displayed smaller on the device, and conversely, it will be displayed larger on the low-resolution device.
viewport - scaling
in On most mobile phones, the default zoom may trigger "zoom" on mobile browsers. To prevent users from zooming, you can set initial-scale=1.0. Here is the complete writing of the mobile window:
Media Queries
CSS Media Queries - max/min-device-width
max-width and min-width are updated when you rotate the screen, your max-width in portrait mode become max-height in landscape mode
When you rotate the phone screen, max-width and min-width will be updated, and the maximum horizontal width will become the maximum height vertically, as shown in the figure:
@media only screen and (min-width : 480px) { .box { width:200px; height:200px; background:yellow; } }@media only screen and (max-width : 320px) { .box {width:200px; height:200px; background:red; } }
Note: The difference between max/min-width and max/min-device-width.
Literally speaking, one is the maximum/minimum width, and the other is the maximum/minimum device width. If width=device-width is set, max/min-width and max/min-device-width are the same in landscape mode. Yes, but it is different in portrait mode. To put it simply, max/min-width will be updated when you rotate the screen, but max/min-device-width will not be updated.
CSS Media Queries - device-pixel-ratio
device-pixel-ratio can let us know the resolution of the device screen. The pixel ratio of some mobile phones will be greater than or equal to 1.5. If If you want to implement layout on high-resolution devices, you can use the following media query:
@media only screen and (-webkit-min-device-pixel-ratio : 1.5),
only screen and (-o-min-device-pixel-ratio: 3/2),
only screen and (min-device-pixel-ratio : 1.5) {
.imagebox { background:(url:"images/high/demo.jpg");}
}
Note: If the above method is used, the image will be the same even if the above rule is not used It will load.
CSS Media Queries - Orientation
Both iPhone and iPad have landscape and portrait screens, use the following media query can use the corresponding css on horizontal and vertical screens respectively
/* iPads (landscape) ----------- */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : landscape) {
/* Styles */
}
/* iPads (portrait) ---------- */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : portrait) {
/* Styles */
}

To build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.

Boolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.

HTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.


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