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| Section | Objectives |
|---|---|
| Web Application Development Concepts | - Client-side storage
|
| HTML Fundamentals | - Document structure and semantics
|
| CSS Styling | - Selectors and styling rules
|
| JavaScript Programming | - Core JavaScript concepts
|
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NEW QUESTION # 45
You need to use a flexbox so that new content you add to the container appears at the highest point on a vertical list. You want to achieve this goal without specifying an order. Which value should you use for flex- direction?
Answer: C
Explanation:
The correct value is column-reverse. The flex-direction property defines the main axis of a flex container and determines whether flex items are laid out horizontally, vertically, or in the reverse direction. column creates a vertical layout where items flow from the top of the container toward the bottom. If new content is appended after existing content, normal column layout places that new item later in the visual list, typically lower on the page. column-reverse preserves a vertical main axis but reverses the visual direction, so later items in the source order appear at the highest visual point of the list. This satisfies the requirement without using the order property on individual flex items. row and row-reverse are incorrect because they create horizontal layouts, not vertical lists. The reverse-direction flex values should be used deliberately because visual order can differ from DOM order, but for this exam scenario, column-reverse is the value that places newly appended vertical content at the top. References/topics: CSS flexbox, flex-direction, main axis, column layout, reverse visual flow.
NEW QUESTION # 46
You create an interface for a touch-enabled application. Some input buttons do not trigger when tapped. What are two possible causes?
Answer: A,D
Explanation:
The correct causes are insufficient input target size and overlapping input areas. Touch interaction depends on hit testing: the browser or platform determines which element occupies the touched screen coordinate and dispatches the event to that element. If a button's active area is too small, the user's finger may visually appear to tap the button while the actual touch coordinate falls outside the actionable target. Microsoft's touch- target guidance recommends touch targets around 7.5 mm square, approximately 40 × 40 pixels on a 135 PPI display, to support reliable activation. Overlap is also a valid cause because one element can partially cover or compete with another during hit testing; W3C target-size guidance notes that overlapping areas should not be counted as usable target area unless the overlapping controls perform the same action. Event handlers are not the problem by themselves; they are the standard mechanism for detecting user input. "Touch screen not initialized" is not a normal HTML5 application-level cause. References/topics: touch input, event handling, hit testing, target size, overlapping controls.
NEW QUESTION # 47
You need to correctly apply a style rule for screen devices with a width of 480 pixels or less.
Complete the code by selecting the correct option from the drop-down list.
Answer:
Explanation:
Explanation:
@media screen and (max-width: 480px) {
/* style rules go here */
}
The correct media query is @media screen and (max-width: 480px) {. The requirement says the style rule must apply to screen devices with a width of 480 pixels or less. In CSS media queries, screen identifies the media type, and (max-width: 480px) defines the upper viewport-width limit. This means the enclosed CSS rules apply when the viewport is 480 pixels wide or any smaller value, which is the standard mobile breakpoint behavior. @media screen and (width: 480px) is incorrect because it applies only when the viewport is exactly 480 pixels wide, not below it. @media screen display and (width: 480px) is invalid syntax because display is not used that way in a media query. @media screen-width: 480px is also invalid because it does not follow the required @media media-type and (feature: value) pattern. References/topics: responsive design, CSS media queries, @media, screen media type, max-width, mobile breakpoint styling.
NEW QUESTION # 48
You are creating a script that reads a JSON menu file and displays the Entree, Price, and Description.
Complete the code by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.
Answer:
Explanation:
Explanation:
First drop-down: var xhr = new XMLHttpRequest();
Second drop-down: if(xhr.status===200){
Third drop-down: responseObject = JSON.parse(xhr.responseText);
The script must first create an XMLHttpRequest object, so the correct first selection is var xhr = new XMLHttpRequest();. This object performs the asynchronous request for menu.json. After the request finishes, the onload callback executes. The response should be processed only when the request succeeds, so the correct status check is if(xhr.status===200){; HTTP status 200 means the file was successfully retrieved.
Status codes 403, 404, and 500 represent forbidden access, missing resource, and server error conditions, so they are not appropriate for normal JSON processing. The JSON file is returned as plain text through xhr.
responseText, so it must be converted into a JavaScript object with JSON.parse(xhr.responseText). Once parsed, the code can access responseObject.menu[i].Entree, Price, and Description inside the loop and build the display output. responseXML is incorrect because the source file is JSON, not XML.
NEW QUESTION # 49
You have created custom error messages for a form. When a user attempts to submit the form with invalid data, the data must remain in the form and error messages must be displayed. Which Event property or method should you use?
Answer: A
Explanation:
The correct method is preventDefault(). During form submission, the browser's default behavior is to submit the form to the target URL, which may navigate away from the current page or reload it. If the submitted data is invalid and the application must display custom error messages while preserving the entered values, the submit event handler should call event.preventDefault(). This cancels the default submit action, allowing the page to remain in place and the script to display validation feedback next to the relevant form controls.
defaultPrevented is not the method to use; it is only a Boolean property that indicates whether preventDefault() has already been called. cancelable is also only informational; it tells whether the event's default behavior can be canceled. abort is unrelated to form validation and does not provide the required control over form submission. References/topics: HTML5 form validation, custom validation messages, submit event, event cancellation, preserving form data.
NEW QUESTION # 50
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