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 */
}

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract

HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.

HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.


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