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【单选题】
Which of the following statements about audio and video attributes is incorrect? ( )
A.
We can use the <audio> tag to import audio files.
B.
When using the <audio> tag, it can be abbreviated as <audio src = "" loop autoplay controls>.
C.
In the <audio> tag, we use src to import audio files.
D.
In the <audio> tag, we must use source to import audio files.
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【单选题】Draw a line on canvas, requiring the start coordinate to be (0,0), the end coordinate to be (100,50), and which one is correct for the following three blanks? ( )<canvas id="myCanvas" width="200px...
A.
ctx.moveFrom(0,0)ctx.lineTo(100,50)ctx.stroke()
B.
ctx.lineFrom(0,0)ctx.lineTo(100,50) ctx.stroke()
C.
ctx.moveTo(0,0)ctx.lineTo(100,50)ctx.stroke()
D.
ctx.moveTo(0,0)ctx.lineTo(100,50) ctx.strokeText()
【多选题】(Multiple-choice question) What methods are used when drawing a circle in canvas? ( )
A.
beginPath()
B.
closePath()
C.
arc()
D.
stroke()
【单选题】Using canvas to draw a graphic, and which option is correct about the following code snippets? ( )ctx.beginPath();ctx.arc(50,170,50,0,Math.PI,false);ctx.stroke();ctx.closePath();
A.
The graphic is a clockwise circle.
B.
The graphic is a counterclockwise circle.
C.
The graphic is a clockwise semicircle.
D.
The graphic is a counterclockwise semicircle.
【多选题】(Multiple-choice question) If you want to create a shadow effect in canvas, what attributes do you need? ( ）
A.
shadowOffsetX
B.
shadowOffsetY
C.
shadowBlur
D.
shadowColor
【单选题】Which of the following statements about svg is incorrect? ( )
A.
Svg can be either a file or a tag.
B.
Svg uses xml format to define graphics.
C.
Svg refers to scalable vector graphics.
D.
The graphics quality of svg will decrease after enlargement.
【单选题】Using svg element to create a rectangle, which of the following statements is incorrect? ( )
A.
Use the <rect> tag to create a rectangle.
B.
Use style="fill: rgb(255,0,0)" to fill the color.
C.
Use style="border-width: 10" to define the border size.
D.
Use style="stroke:rgb(0,0,0)" to define the border color.
【单选题】Use svg to draw a circle with center at (100,100), radius 50, border width 5 and color blue, the code is ( ).
A.
<circle x="100" y="100" r="50" stroke-color="blue" stroke-width="5"></circle>
B.
<circle x="100" y="100" r="50" stroke="blue" stroke-width="5"></circle>
C.
<circle cx="100" cy="100" r="50" stroke="blue" stroke-width="5"></circle>
D.
<circle cx="100" cy="100" r="50" stroke-color="blue" stroke-width="5"></circle>
【单选题】Compared with the common image format, which of the following is not an advantage of svg? ( )
A.
Svg graphics can be searched, indexed and scripted, but not compressed.
B.
Svg graphicscan be scaled.
C.
Svg graphics can be printed with high quality at any resolution.
D.
Svg can be enlarged without degradation of graphicsquality.
【单选题】In css3, which of the following statements about text shadow isincorrect? ( )
A.
Use text-shadow to define text shadow.
B.
Text shadow can be divided into inner shadow and outer shadow.
C.
Text shadow has no extended edge.
D.
The text-shadow:1px 1px 1px red; indicates horizontal shadow value, vertical shadow value, blur-radius and shadow color respectively.
【多选题】(Multiple-choice question) In the absence of padding, the drawing area of background is changed from including the border to not including the border. As shown in the renderings below, which of the fo...
A.
background-clip: padding-box;
B.
background-clip: content-box;
C.
background-clip: border-box;
D.
background-position: border-box;