INF-306試験解答 & INF-306試験参考書

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IT Specialist INF-306 Exam Syllabus Topics:

SectionObjectives
Topic 1: JavaScript Coding- JavaScript ES6 Development
  • 1. Use JavaScript APIs
  • 2. Handle events using listeners and handlers
  • 3. Manage application state
  • 4. Perform data access using JavaScript
  • 5. Create and use custom classes
Topic 2: Forms- HTML5 Forms and Validation
  • 1. Validate required fields and data types
  • 2. Construct forms using HTML5 form elements
  • 3. Configure input validation and regular expressions
  • 4. Use datalist, fieldset, meter, legend, and output elements
Topic 3: Graphics and Animation- Canvas and SVG
  • 1. Create and display graphics using SVG
  • 2. Apply transformations and styling to graphics
  • 3. Use the canvas element to create graphics and animations
  • 4. Apply CSS filters to images
Topic 4: Layouts- Responsive and Flexible Layouts
  • 1. Manage content overflow and flow behavior
  • 2. Construct responsive layouts
  • 3. Use CSS Grid layouts
  • 4. Use CSS Flexbox
  • 5. Manage content layout and positioning with CSS
Topic 5: Application Lifecycle Management- Application Development Lifecycle
  • 1. Identify runtime and validation errors
  • 2. Describe planning, design, development, testing, deployment, and maintenance stages
  • 3. Debug and test web applications
  • 4. Use debugging tools and breakpoints

>> INF-306試験解答 <<

INF-306試験参考書、INF-306復習内容

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IT Specialist HTML5 Application Development 認定 INF-306 試験問題 (Q22-Q27):

質問 # 22
Which two CSS segments are valid filter properties? Choose 2.

正解:C、D

解説:
The valid filter declarations are filter: opacity(25%) and filter: drop-shadow(16px 16px 16px red). The CSS filter property applies graphical effects to an element, commonly including image rendering effects such as blur, contrast, color shifts, transparency, and shadows. opacity(25%) is a valid filter function because filter opacity accepts a percentage or number to control the rendered transparency of the element. drop-shadow (16px 16px 16px red) is also valid because drop-shadow() is a CSS filter function, and MDN shows that it accepts two or three length values plus an optional color. box-shadow(...) is invalid in this context because box-shadow is a standalone CSS property, not a filter function; MDN explicitly distinguishes drop-shadow() from the box-shadow property. blur(25deg) is invalid because blur uses a length value such as pixels, not an angular value such as degrees. References/topics: CSS filter property, image effects, opacity filter, drop- shadow filter, valid filter-function syntax.


質問 # 23
The logo shown is displayed on a web page as an SVG.
Note: The coordinate values are labeled for reference.
Evaluate the image on the left and complete the markup by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.

正解:

解説:

Explanation:

The SVG image is built from three filled polygon faces, one white ellipse, and two white diagonal line segments. The three < polygon > elements define the black cube faces by connecting multiple coordinate points. The small white oval on the top face must be an < ellipse > because the markup uses cx, cy, rx, and ry; these attributes define an ellipse center point and horizontal/vertical radii. The diagonal marks on the left and right faces are straight segments, so they must use the SVG < line > element. A line is defined with starting coordinates x1, y1 and ending coordinates x2, y2. The first diagonal runs from the bottom point (200,365) to the upper-left point (50,100). The second diagonal must mirror it on the right side, so it starts at (200,365) and ends at (350,100). Therefore, the final coordinate selection is x2= " 350 " y2= " 100 " . References/topics:
SVG shapes, < polygon > , < ellipse > , < line > , coordinate-based vector drawing, SVG markup construction.


質問 # 24
Which JavaScript method is used to draw a circle on a canvas?

正解:A

解説:
The correct method is arc(). In the Canvas 2D API, circles and circular arcs are drawn by creating an arc path on the canvas rendering context. MDN defines CanvasRenderingContext2D.arc() as creating a circular arc centered at (x, y) with a specified radius, start angle, end angle, and drawing direction. To draw a full circle, the common pattern is to call beginPath(), then arc(x, y, radius, 0, 2 * Math.PI), and then use stroke() or fill() to render the path. There is no standard Canvas 2D method named circle(), so option A is invalid. ellipse() can draw ellipses and can mathematically draw a circle if both radii are equal, but the classic and exam-targeted method for drawing a circle is arc(). bezierCurveTo() draws cubic Bezier curves and is used for custom curved paths, not the direct circle primitive. References/topics: Canvas 2D context, arc() method, drawing circles, radians, path rendering.


質問 # 25
Which value does the following JavaScript code fragment store in the variable num?
var num = localStorage.length;

正解:C

解説:
The value stored in num is the number of key-value pairs currently stored in localStorage. The localStorage object implements the Web Storage Storage interface, which stores data as named string key/value entries for the current origin. Its length property is read-only and returns the number of data items stored in that Storage object, not the size of the stored data and not the remaining capacity. MDN's Storage reference explicitly defines length as returning the number of data items stored, and its example shows that after three items are added to localStorage, localStorage.length returns 3. Therefore, if the storage area contains five named entries, num receives 5; if it contains no entries, num receives 0. Option A is incorrect because available bytes are not exposed through length. Option B is unrelated to Web Storage. Option C is incorrect because browser storage quota or capacity is separate from the length property. References/topics: Web Storage API, localStorage, Storage.length, key-value storage, application state.


質問 # 26
A local photographer asks you to add filters as shown to the images in their photo gallery so that the images are not recognizable until authorized users log in.
Example of original and filtered images:
* Original image: full-color flower image
* Filtered image: blurred grayscale image

Analyze the images on the left.
Construct a CSS selector that will apply the appropriate filters to the images to meet the requirements.
Complete the markup by moving the appropriate HTML tags from the list on the left to the correct locations on the right. You may use each HTML tag once, more than once, or not at all.
Note: There is more than one correct markup. You will receive credit for any correct markup completion.

正解:

解説:

Explanation:
First blank: img
Second blank: filter:
Third blank: grayscale(100%)
Fourth blank: blur(8px)
The correct CSS selector is img because the requirement applies the visual effect to gallery images. The correct property is filter:, not transform:, because CSS filters modify the rendered appearance of an element using image-processing effects such as blur, grayscale, opacity, brightness, contrast, and shadows. The filtered sample appears blurred and colorless, so the appropriate filter functions are grayscale(100%) and blur (8px). grayscale(100%) removes all color from the image, converting it to a black-and-white rendering. blur (8px) obscures visual details, making the image difficult to recognize until the protected or authorized state changes the styling. The filter keyword without a colon is not a valid CSS declaration in this context.
brightness(40%) and opacity(50%) could further obscure an image, but they are not required to reproduce the shown filtered result. The final declaration is therefore filter: grayscale(100%) blur(8px);.


質問 # 27
......

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