HTML5 provides some very powerful JavaScript and HTML APIs to help developers build amazing desktop and mobile applications. This article will introduce 5 new APIs, hoping to be helpful to your development work.
1. Fullscreen API
This API allows developers to programmatically run web applications in full screen, making web applications more like native applications.
// Find the full screen method suitable for the browser
function launchFullScreen(element) {
if(element.requestFullScreen) {
element.requestFullScreen();
} else if(element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if(element.webkitRequestFullScreen) {
element.webkitRequestFullScreen();
}
}
// Launch full screen mode
launchFullScreen(document.documentElement); // the whole page
launchFullScreen(document.getElementById("videoElement")); // any individual element
2. Page Visibility API (Page Visibility API)
This API can be used to detect the visibility of the page to the user, that is, return the status change of the page or tab currently browsed by the user.
// Set hidden attributes and visible change events The name and attributes need to be added with the browser prefix
// since some browsers only offer vendor-prefixed support
var hidden, state, visibilityChange;
if (typeof document.hidden !== "undefined") {
hidden = "hidden";
visibilityChange = "visibilitychange";
state = "visibilityState";
} else if (typeof document.mozHidden !== "undefined") {
hidden = "mozHidden";
visibilityChange = "mozvisibilitychange";
state = "mozVisibilityState";
} else if (typeof document.msHidden !== "undefined") {
hidden = "msHidden" ;
visibilityChange = "msvisibilitychange";
state = "msVisibilityState";
} else if (typeof document.webkitHidden !== "undefined") {
hidden = "webkitHidden";
visibilityChange = "webkitvisibilitychange";
state = "webkitVisibilityState";
}
// Add a listener for title change
document.addEventListener(visibilityChange, function(e) {
// Start or stop status processing
}, false);
3. getUserMedia API
This API allows web applications to access the camera and microphone without using plug-ins.
// Set event listener
window.addEventListener("DOMContentLoaded", function() {
// Get element
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"),
video = document.getElementById("video"),
videoObj = { "video": true },
errBack = function(error) {
console.log("Video capture error: ", error .code);
};
// Set video listener
if(navigator.getUserMedia) { // Standard
navigator.getUserMedia(videoObj, function(stream) {
video. src = stream;
video.play();
}, errBack);
} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
navigator.webkitGetUserMedia(videoObj, function(stream ){
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
}
}, false);
4. Battery API
This is an API for mobile device applications, mainly used to detect device battery information.
var 배터리 = navigator.battery || navigator.mozBattery;
// 배터리 속성
console.warn("배터리 충전: ", 배터리 충전) // true
console.warn("배터리 수준: ", Battery.level); // 0.58
console.warn("배터리 방전 시간: ", Battery.dischargeTime)// 이벤트 리스너 추가
🎜>battery.addEventListener("chargechange", function(e) {
console.warn("배터리 충전 변경: ", 배터리.충전);
}, false);
5. 링크 미리 가져오기
웹페이지 콘텐츠를 미리 로드하여 시청자에게 원활한 탐색 경험을 제공하세요.

MicrodatainHTML5enhancesSEOanduserexperiencebyprovidingstructureddatatosearchengines.1)Useitemscope,itemtype,anditempropattributestomarkupcontentlikeproductsorevents.2)TestmicrodatawithtoolslikeGoogle'sStructuredDataTestingTool.3)ConsiderusingJSON-LD

HTML5introducesnewinputtypesthatenhanceuserexperience,simplifydevelopment,andimproveaccessibility.1)automaticallyvalidatesemailformat.2)optimizesformobilewithanumerickeypad.3)andsimplifydateandtimeinputs,reducingtheneedforcustomsolutions.

H5 is HTML5, the fifth version of HTML. HTML5 improves the expressiveness and interactivity of web pages, introduces new features such as semantic tags, multimedia support, offline storage and Canvas drawing, and promotes the development of Web technology.

Accessibility and compliance with network standards are essential to the website. 1) Accessibility ensures that all users have equal access to the website, 2) Network standards follow to improve accessibility and consistency of the website, 3) Accessibility requires the use of semantic HTML, keyboard navigation, color contrast and alternative text, 4) Following these principles is not only a moral and legal requirement, but also amplifying user base.

The H5 tag in HTML is a fifth-level title that is used to tag smaller titles or sub-titles. 1) The H5 tag helps refine content hierarchy and improve readability and SEO. 2) Combined with CSS, you can customize the style to enhance the visual effect. 3) Use H5 tags reasonably to avoid abuse and ensure the logical content structure.

The methods of building a website in HTML5 include: 1. Use semantic tags to define the web page structure, such as, , etc.; 2. Embed multimedia content, use and tags; 3. Apply advanced functions such as form verification and local storage. Through these steps, you can create a modern web page with clear structure and rich features.

A reasonable H5 code structure allows the page to stand out among a lot of content. 1) Use semantic labels such as, etc. to organize content to make the structure clear. 2) Control the rendering effect of pages on different devices through CSS layout such as Flexbox or Grid. 3) Implement responsive design to ensure that the page adapts to different screen sizes.

The main differences between HTML5 (H5) and older versions of HTML include: 1) H5 introduces semantic tags, 2) supports multimedia content, and 3) provides offline storage functions. H5 enhances the functionality and expressiveness of web pages through new tags and APIs, such as and tags, improving user experience and SEO effects, but need to pay attention to compatibility issues.


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