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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Forms | 20% | - Form elements and markup
|
| Topic 2: JavaScript Coding | 15% | - APIs and state management
|
| Topic 3: Graphics and Animation | 25% | - Canvas element usage
|
| Topic 4: Application Lifecycle Management | 20% | - Testing and debugging
|
| Topic 5: Layouts | 20% | - CSS layout and positioning
|
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질문 # 63
You need to draw a blue rectangle that meets these conditions:
* It is 200 by 200 pixels.
* It contains a white circle that is centered within the rectangle.
* The circle has a 50-pixel radius.
* The image should appear as follows: a blue square with a centered white circle.
Refer to the image on the left.
You need to ensure that the image scales without distortion when the page is resized. You must not be required to use JavaScript.
Complete the code by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.
정답：
설명：
Explanation:
First blank: < svg width= " 200 " height= " 200 " >
Second blank: < rect width= " 200 " height= " 200 "
Third blank: < circle cx= " 100 " cy= " 100 " r= " 50 "
Fourth blank: < /svg >
The correct solution uses SVG because SVG graphics are vector-based and can scale without pixel distortion when the page or viewport changes. A < canvas > element would require script-based drawing logic, which violates the requirement that JavaScript must not be required. An < img > or < picture > element can display an image, but those options do not define the rectangle and circle directly in markup. The outer container must therefore be < svg width= " 200 " height= " 200 " > . The blue square is created with < rect width= " 200 " height= " 200 " fill= " blue " / > , which produces a rectangle matching the required 200-by-200 dimensions.
The centered white circle must use SVG circle geometry: cx= " 100 " and cy= " 100 " place the center at the midpoint of the 200-by-200 square, and r= " 50 " creates the required 50-pixel radius. The final closing tag must be < /svg > .
질문 # 64
Which markup segment uses the output element to display the combined value of two input elements in HTML5?
정답：B
설명：
Option C is the only segment that correctly combines three required pieces: two contributing < input > controls, a named < output > control, and executable form-level logic that assigns a calculated value into that output. The HTML < output > element is specifically designed as a container for the result of a calculation or user action, and its for attribute identifies the controls that contributed to the calculation by using a space- separated list of element identifiers or associated names in the form workflow. MDN's reference demonstrates this exact pattern: two input values are added, and the result is assigned to an < output > element whenever input changes. Option A renders literal text inside < output > but does not update it. Option B has no < output
> element at all, so it cannot satisfy the requirement. Option D declares an output but lacks an oninput handler or script assignment, so the displayed value never changes. References/topics: HTML5 forms, < output > element, for attribute, form input events, calculated form results.
질문 # 65
Move the appropriate attributes from the list on the left to the correct descriptions on the right. You may use each attribute once, more than once, or not at all.
Note: You will receive partial credit for each correct match.
정답：
설명：
Explanation:
pattern # Provides a way to set a regular expression that the value must match placeholder # Provides a way to set default text that displays until focus is placed in an element required # Provides a way to set form elements as mandatory multiple # Provides a way to allow more than one file or email address in a single input The correct matches are based on standard HTML5 form validation and input-attribute behavior. The pattern attribute defines a regular expression that the input value must satisfy before the form can be submitted successfully. It is commonly used for structured values such as phone numbers, codes, postal formats, or custom identifiers. The placeholder attribute supplies short hint text inside an input field, helping the user understand the expected value before entering data. The required attribute makes a form control mandatory; if the field is empty, constraint validation prevents successful submission. The multiple attribute allows a single input to accept more than one value, specifically for controls such as input type= " file " and input type= " email " , where users may upload multiple files or enter multiple email addresses. The maxlength attribute is not used in these matches because it limits the maximum number of characters that can be entered, but none of the listed descriptions asks for character-length restriction. References/topics: HTML5 form attributes, constraint validation, pattern, placeholder, required, multiple, input validation.
질문 # 66
The ctx variable is the context of an HTML5 canvas object. What does the following HTML markup draw?
ctx.arc(x, y, r, 0, Math.PI, true);
정답：D
설명：
The statement draws a semicircle at the specified point. The arc() method of the Canvas 2D API adds a circular arc to the current path. Its core parameters are the center point x, y, the radius, the starting angle, the ending angle, and an optional direction flag. In this expression, x and y define the center of the arc, and r defines its radius. The start angle is 0 radians, and the end angle is Math.PI radians. Since Math.PI represents
180 degrees, the path covers exactly half of a full circle. The final argument, true, tells the canvas context to draw the arc counterclockwise rather than using the default clockwise direction; however, the angular span remains half of the circumference. The call does not draw a complete visible shape unless the path is later stroked or filled, but the geometric path being created is a semicircular arc. It is not a straight line, square, or full circle. References/topics: Canvas 2D context, arc() method, radians, path construction, drawing arcs and circles.
질문 # 67
Which two background graphics will automatically adjust to different screen sizes? Choose 2.
Note: You will receive partial credit for each correct selection.
정답：C,D
설명：
The correct answers are A and C because background-size: contain and background-size: cover are the CSS values that scale a background image in response to the size of the element or viewport. contain scales the background image as large as possible while preserving the entire image inside the background area. This prevents cropping and maintains the image's aspect ratio, although empty space may appear if the container and image proportions differ. cover also preserves the aspect ratio, but scales the image until the entire background area is filled; this may crop part of the image, but it prevents empty space. Both values are commonly used in responsive design because the image automatically recalculates its rendered size as the page or element changes dimensions. initial resets the property to its default behavior and does not intentionally create responsive scaling. auto uses the image's intrinsic dimensions or proportional automatic sizing, so it does not reliably adjust the graphic to different screen sizes in the way required. References
/topics: responsive design, CSS background images, background-size, contain, cover, viewport-based scaling.
질문 # 68
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