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| Section | Objectives |
|---|---|
| Topic 1: JavaScript Programming | - DOM manipulation
|
| Topic 2: CSS Styling | - Layout and responsive design
|
| Topic 3: HTML Fundamentals | - Forms and input elements
|
| Topic 4: Web Application Development Concepts | - Client-side storage
|
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質問 # 46
You define the following layout:
< !DOCTYPE html >
< html >
< head >
< style >
section {
display: flex;
align-items: center;
flex-wrap: wrap;
min-height: 200px;
width: 700px;
background: linen;
}
section p {
flex: 1;
min-width: 200px;
padding: 20px;
}
< /style >
< /head >
< body >
< h2 > Exhibits to visit at the zoo < /h2 >
< section >
< p style= " order: 3 " > Lions < /p >
< p style= " order: 4 " > Tigers < /p >
< p style= " order: 2 " > Bears < /p >
< p style= " order: 1 " > Zoo Trip < /p >
< /section >
< /body >
< /html >
For each statement about the markup shown on the left, select True or False.
正解：
解説：
Explanation:
The paragraph containing the text Tigers will display first.
False
The section p CSS refers to the parent flexbox container.
False
When the paragraphs have a width less than 200px, the last paragraph will wrap to the next line.
True
The parent flexbox container is the section element because it has display: flex;. The paragraphs inside the section become flex items. The display order is controlled by each paragraph's inline order value, and flex items are laid out from the lowest order value to the highest. Therefore, Zoo Trip with order: 1 displays first, followed by Bears, Lions, and finally Tigers; the statement that Tigers displays first is false. The selector section p does not refer to the parent flexbox container. It targets paragraph elements inside a section, meaning it styles the flex items, not the flex container. The container itself is targeted by the section rule. The final statement is true in intent because flex-wrap: wrap; allows flex items to move to a new line when they cannot fit in the available row. Since each paragraph has min-width: 200px, items are prevented from shrinking below that minimum and wrapping occurs when available space is insufficient. References/topics:
CSS flexbox, flex container, flex items, order, flex-wrap, min-width.
質問 # 47
You need to display the following user interface:
Motorcycle
Truck
Boat
Car
Bicycle
Complete the markup by selecting the correct option from each drop-down list.
正解：
解説：
Explanation:
First drop-down: datalist
Second drop-down: vehicles
Third drop-down: < /datalist >
The correct element is < datalist > because the interface requires a text input that provides selectable suggestions while still allowing the user to type. The < input > element uses list= " vehicles " , so it must be connected to a < datalist > element whose id is exactly vehicles. The id cannot be vehicle, because vehicle is already the input element's own identifier and does not match the value used by the list attribute. The < option
> elements inside the datalist define the suggested values: Motorcycle, Truck, Boat, Car, and Bicycle. ul, ol, and li are list-markup elements and do not create input suggestions. select would create a fixed dropdown list, but it would not match the editable input-with-suggestions behavior shown. The closing tag must match the opening datalist element, so the final selection is < /datalist > .
質問 # 48
Which three methods are associated with the HTML5 localStorage API? Choose 3.
正解：B、D、E
解説：
The correct methods are setItem(), removeItem(), and clear(). The HTML5 Web Storage API exposes localStorage as a persistent key-value storage object for the current origin. Data stored in localStorage remains available after page reloads and browser restarts unless it is explicitly removed or cleared. setItem (key, value) stores a value under a named key or updates the value if the key already exists. removeItem(key) deletes one specific key-value pair from storage. clear() removes all key-value pairs from the storage object for that origin. These methods are part of the standard Storage interface used by both localStorage and sessionStorage. write is not a Web Storage method; it is associated with document-writing behavior, not application state storage. cookie is also incorrect because cookies are a separate browser storage mechanism accessed through document.cookie, not a method of localStorage. References/topics: Web Storage API, localStorage, Storage interface, application state, persistent key-value data.
質問 # 49
Which two application features should you implement by using session storage? Choose 2.
正解：A、D
解説：
The correct features are saving temporary authentication tokens and passing form data to a confirmation page.
sessionStorage provides a storage area scoped to the current origin and browser tab, and its data is retained only for the duration of the page session. That makes it appropriate for short-lived application state that must survive page reloads or navigation within the same workflow, but should not remain permanently available after the session ends. Passing form data from an entry page to a confirmation page is a classic session-scoped use case because the data is needed briefly during a multi-page transaction. Temporary authentication tokens can also fit the session-storage model when the token should be tied to the active browser session rather than persisted across future visits. Customized UI/UX settings usually need to persist across sessions, so localStorage or server-side user preferences are more appropriate. Game progress saved for future use is also persistent state, not session-only state. Passing data to a function is ordinary JavaScript memory usage and does not require Web Storage. References/topics: application state management, Web Storage API, sessionStorage, temporary workflow data, session-scoped tokens.
質問 # 50
Which markup segment uses the output element to display the combined value of two input elements in HTML5?
正解：B
解説：
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.
質問 # 51
......
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