Summary of front end interview questions - HTML5 (under continuous update)

JavaScript language 2020-11-13 05:04:22
summary end interview questions html5

Summary of front-end interview questions ——H5( Ongoing update )

1.HTML5 Why just write ?

HTML5 need doctype To regulate browser behavior , Let browsers run as they should ;
HTML4.01 be based on SGML, So you need to DTD reference , To tell the browser what type of document the document is using .

2.HTML5 Of form How to turn off autocomplete ?

To those who don't want to be prompted form Or some input Set to autocomplete=off.

3.HTML5 How to embed audio in ?

At present ,audio Element supports three audio formats :

<source src=”jamshed.mp3″ type=”audio/mpeg”>
<source src=”jamshed.ogg″ type=”audio/ogg”>
Your browser does’nt support audio embedding feature.

4.HTML5 How to embed video in ?

At present ,video Element supports three video formats :

<source src="movie.ogg" type="video/ogg">
<source src="movie.mp4" type="video/mp4">
Your browser does not support the video tag.

5. except audio and vidio,HTML5 What other media labels ?

Tags define embedded content , Like plug-ins .

Tags allow you to specify alternative videos / The audio file is used by the browser to select the media type or codec support .
<source src="movie.ogg" type="video/ogg">
<source src="movie.mp4" type="video/mp4">
Your browser does not support the video tag.
Play a video with subtitles :
<source src="forrest_gump.mp4" type="video/mp4" />
<source src="forrest_gump.ogg" type="video/ogg" />
<track kind="subtitles" src="" srclang="zh" label="Chinese">
<track kind="subtitles" src="" srclang="en" label="English">

6.HTML5 canvas What's the use of elements ?

Used to draw graphics on a web page , The powerful feature of this element tag is that it can be directly in HTML5 On the graphic operation
<!doctype html>

<meta charset="UTF-8">
<canvas id="canvas"></canvas>
var canvas=document.getElementById('canvas');
var ctx=canvas.getContext('2d');

7.HTML5 What new API?

1:canvas, Needless to say , Can draw a lot of gorgeous graphics , You can even fake it directly 3D game .

2: Media control , It's easy to understand ( Literal translation is the playback function , If only html5.0 The label below says , In the past, it was impossible to play music with scrollbars .)

3: Offline web application , The resource file can be completely cached in the client , And through js Some ways to empty the cache

4: Document editing , It should be better to support the editing of documents .

5: Drag the , You can drag files to certain areas to upload

6: Cross document request ,websocket, A more efficient way of communication

7: History management , Can pass js Manage and insert history

8:MIME Head customization

9: Client data storage ,localstoage sessionstoage

10: Location sharing

11: Local database

12: Index database

8.HTML5 What's the difference between application caching and browser caching ?

HTML5 Introduced application caching , It means web Applications can be cached , It can be accessed when there is no Internet connection .
Application caching brings three advantages to applications :
Offline browsing - Users can use applications when they are offline
Speed - Cached resources load faster
Reduce server load - The browser will only download updated or changed resources from the server .
Realize by means of manifest file

9. You can have the HTML Add new elements .


10.Canvas And SVG Comparison :

SVG It's a use XML describe 2D The language of graphics .Canvas adopt JavaScript To draw 2D graphics .
Svg Support event handler ,canvas Event handler is not supported
stay SVG in , Every drawing is treated as an object , and canvas Be able to .png or .jpg Format to save the resulting image
If SVG The properties of the object change , So the browser can automatically reproduce the graphics .

11.HTML5 New form elements :

Recommended reading :

learn Python The programmer , Programming skills are “ degeneration ” What is it like ?

What is the route of learning front-end development ? Internet trends , Skill needs

Choosing programmers , It means lifelong learning , Comfort in front of you , It's just a hotbed of bewilderment

Programmer's skill tree , Determines the height of a lifetime career

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