meta基础知识
H5页面窗口自动调整到设备宽度，并禁止用户缩放页面
1 <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" />
viewport模板——通用
<!DOCTYPE html><html><head><meta charset="utf-8"><meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" name="viewport"><meta content="yes" name="apple-mobile-web-app-capable"><meta content="black" name="apple-mobile-web-app-status-bar-style"><meta content="telephone=no" name="format-detection"><meta content="email=no" name="format-detection"><title>标题</title><link rel="stylesheet" href="index.css"></head>
移动端touch事件
当用户手指放在移动设备在屏幕上滑动会触发的touch事件
touchstart——当手指触碰屏幕时候发生。
touchmove——当手指在屏幕上滑动时连续触发。通常我们再滑屏页面，会调用event的preventDefault()可以阻止默认情况的发生：阻止页面滚动
touchend——当手指离开屏幕时触发
touchcancel——系统停止跟踪触摸时候会触发。例如在触摸过程中突然页面alert()一个提示框，此时会触发该事件，这个事件比较少用
TouchEvent
touches：屏幕上所有手指的信息
targetTouches：手指在目标区域的手指信息
changedTouches：最近一次触发该事件的手指信息
touchend时，touches与targetTouches信息会被删除，changedTouches保存的最后一次的信息，最好用于计算手指信息
webkit表单元素的默认外观怎么重置
.css{-webkit-appearance:none;}
webkit表单输入框placeholder的颜色值能改变么
input::-webkit-input-placeholder{color:#AAAAAA;}
input:focus::-webkit-input-placeholder{color:#EEEEEE;}
webkit表单输入框placeholder的文字能换行么
ios可以，android不行~
::-ms-expand 适用于表单选择控件下拉箭头的修改，有多个属性值，设置它隐藏 (display:none) 并使用背景图片来修饰可得到我们想要的效果。
select::-ms-expand {
display: none;
}
audio元素和video元素在ios和andriod中无法自动播放
应对方案：触屏即播
$('html').on('touchstart',function(){
audio.play()
})
播放视频不全屏
The Future of HTML: Evolution and TrendsMay 13, 2025 am 12:01 AMThe future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.
Why are HTML attributes important for web development?May 12, 2025 am 12:01 AMHTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese
What is the purpose of the alt attribute? Why is it important?May 11, 2025 am 12:01 AMThe alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.
HTML, CSS, and JavaScript: Examples and Practical ApplicationsMay 09, 2025 am 12:01 AMThe roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.
How do you set the lang attribute on the tag? Why is this important?May 08, 2025 am 12:03 AMSetting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.
What is the purpose of HTML attributes?May 07, 2025 am 12:01 AMHTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform
How do you create a list in HTML?May 06, 2025 am 12:01 AMTocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.
HTML in Action: Examples of Website StructureMay 05, 2025 am 12:03 AMHTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.
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