Pass the WGU Courses and Certificates Web-Development-Applications Questions and answers with CertsForce

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Suggested Solution Expert Solution

Answer

D

Show Explanation

Explanation

The

tag is used in HTML to create a drop-down list. It is used in conjunction with the tags to define the list items within the drop-down menu.

Purpose of <select>: The element is used to create a control that provides a menu of options. The user can select one or more options from the list.

Structure of Drop-down List:

The

element encloses the elements.

Each element represents an individual item in the drop-down list.

Usage Example:

Choose a car:

Volvo

Saab

Fiat

Audi

In this example, the tag creates a drop-down list with four options: Volvo, Saab, Fiat, and Audi.

Attributes of <select>:

name: Specifies the name of the control, which is submitted with the form data.

id: Used to associate the

element with a label using the tag's for attribute.

multiple: Allows multiple selections if set.

References:

MDN Web Docs on

W3C HTML Specification on Forms

Questions # 12:

Given the following code:



Which type of user input does the developer request by specifying the pattern attribute?

Options:

---

A.

Date

---

B.

Country code

---

C.

price

---

D.

Latitude/longitude

---

Suggested Solution Expert Solution

Answer

D

Show Explanation

Explanation

The pattern attribute in the <input> element is used to specify a regular expression that the input's value must match for it to be considered valid. The given pattern -?\d{1,3}\.\d+ matches strings that represent decimal numbers with an optional negative sign, typically used for latitude and longitude values.

Pattern Explanation:

-? allows for an optional negative sign.

\d{1,3} matches one to three digits.

\. matches a literal dot.

\d+ matches one or more digits.

Usage Example:

<input type="text" pattern="-?\d{1,3}\.\d+" placeholder="Enter latitude or longitude">

This pattern ensures the input matches the format of latitude/longitude values.

References:

MDN Web Docs on <input> pattern attribute

Regular Expressions Documentation

Questions # 13:

Given the following CSS:



What is being configured?

Options:

---

A.

Rendering to the canvas

---

B.

Processing in the browser

---

C.

Processing on a server

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Suggested Solution Expert Solution

Answer

B

Show Explanation

Explanation

The given CSS configures properties that control the processing of animations directly in the browser.

CSS Animations: CSS animations are processed by the browser's rendering engine. The animations defined by CSS are handled client-side and do not require server-side processing.

Key Properties:

Questions # 14:

Which code segment contains a conditional expression?

A)



B)



C)



D)



Options:

---

A.

Option A

---

B.

Option B

---

C.

Option C

---

D.

Option D

---

Suggested Solution Expert Solution

Answer

D

Show Explanation

Explanation

A conditional expression in JavaScript is an expression that evaluates to a boolean value and controls the execution flow based on its result. The conditional (ternary) operator ? : is used for conditional expressions.

Example Analysis:

Option A:

var result = dataCount;

This is a simple assignment, not a conditional expression.

Option B:

var result = count++ > 10;

This is a comparison but not a complete conditional expression.

Option C:

var result = dataCount++ * 1000 == 3000000;

This is an arithmetic operation followed by a comparison but not a complete conditional expression.

Option D:

javascript

Copy code

var result = count >= 10 ? "Done" : getResult();

This is a conditional (ternary) expression. If count is greater than or equal to 10, result will be "Done", otherwise, it will call getResult().

References:

MDN Web Docs - Conditional (ternary) operator

W3Schools - JavaScript Conditions

Questions # 15:

Where can users items using the HTML

Options:

---

A.

From a web page to another web page

---

B.

From a user's computer to another computer

---

C.

From a user's computer to a web page

---

D.

From a web page to a user's computer

---

Suggested Solution Expert Solution

Answer

C

Show Explanation

Explanation

Using HTML, users can upload files from their computer to a web page using the <input> element with the type="file" attribute.

File Upload Input: The <input type="file"> element is used in forms to allow users to select files from their local file system to be uploaded to a server.

Usage Example:

The element in HTML5 is used to render images and graphics dynamically through JavaScript. It is a powerful feature for creating graphics, game visuals, data visualizations, and other graphical content directly in the browser.

Canvas Element: The element is an HTML tag that, with the help of JavaScript, can be used to draw and manipulate graphics on the fly.

Usage Example:

html

Copy code

<script>

var canvas = document.getElementById("myCanvas");

var ctx = canvas.getContext("2d");

ctx.fillStyle = "#FF0000";

ctx.fillRect(0, 0, 200, 100);

</script>

In this example, a red rectangle is drawn on a canvas element.

References:

MDN Web Docs on

W3C HTML Canvas 2D Context Specification

<form action="/upload" method="post" enctype="multipart/form-data">

<input type="file" name="fileToUpload" id="fileToUpload">

<input type="submit" value="Upload File" name="submit">

In this example, users can choose a file from their computer and upload it to the specified server endpoint.

References:

MDN Web Docs on <input type="file">

W3C HTML Specification on File Upload

Questions # 16:

Which code segment creates a slider field that accepts a numeric value ranging from 1 through 10?

A)



B)



C)



D)



Options:

---

A.

Option A

---

B.

Option B

---

C.

Option C

---

D.

Option D

---

Suggested Solution Expert Solution

Answer

B

Show Explanation

Explanation

To create a slider field that accepts a numeric value ranging from 1 through 10, the input element with type="range" should be used. The min and max attributes define the range of acceptable values.

HTML Input Type range:

Purpose: The range type is used for input fields that should contain a value from a specified range.

Attributes:

type="range": Specifies that the input field should be a slider.

min="1": Sets the minimum acceptable value.

max="10": Sets the maximum acceptable value.

Example:

Given the HTML:

<input type="range" name="sat-level" min="1" max="10">

Options Analysis:

Option A:

<input type="number" name="sat-level" max="10">

This creates a numeric input field, not a slider.

Option B:

<input type="range" name="sat-level" min="1" max="10">

This is the correct option that creates a slider field with the specified range.

Option C:

<input type="number" name="sat-level" min="1" max="10">

This creates a numeric input field, not a slider.

Option D:

<input type="range" name="sat-level" max="10">

This creates a slider but lacks the min attribute, so it doesn't fully meet the requirement.

References:

MDN Web Docs - <input type="range">

W3Schools - HTML Input Range

By using the correct attributes, the slider field will allow users to select a value between 1 and 10.

Questions # 17:

What should a developer correct before revalidating after a code validator reports multiple errors in code?

Options:

---

A.

Only CSS errors

---

B.

The last reported error

---

C.

Only JavaScript errors

---

D.

The first reported error

---

Suggested Solution Expert Solution

Answer

D

Show Explanation

Explanation

When using a code validator to check your HTML, CSS, or JavaScript code, it's essential to address errors in a systematic manner. The correct approach is to correct the first reported error before revalidating. This method is recommended because often, the first error can cause a cascade of subsequent errors or warnings. By fixing the first error, you may automatically resolve other errors that were reported later.

Reasoning:

Cascading Errors: The first error in the code might lead to multiple subsequent errors. Fixing it can sometimes resolve those cascading errors, reducing the overall number of errors in the next validation.

Logical Flow: Addressing errors in the order they appear maintains a logical flow and makes debugging more manageable.

Steps to Follow:

Step 1: Run the code through the validator.

Step 2: Identify the first reported error.

Step 3: Correct the first error.

Step 4: Revalidate the code to check if the error count has reduced or if new errors appear.

Step 5: Repeat the process until all errors are resolved.

References:

W3C Markup Validation Service

MDN Web Docs - Debugging HTML

W3C CSS Validation Service

Questions # 18:

Given the following JavaScript code:



What happens when this code is executed?

Options:

---

A.

The object with the id demo is changed to x.

---

B.

The object with the id innerHTML is changed to 6.

---

C.

The object with the demo is changed to 6.

---

D.

The object with the id innerHTML is changed to x.

---

Suggested Solution Expert Solution

Answer

C

Show Explanation

Explanation

The provided JavaScript code sets a variable x to 6 and then assigns this value to the innerHTML of the HTML element with the id demo.

var x;

x = 6;

document.getElementById("demo").innerHTML = x;

Explanation:

Variable Declaration: var x; declares the variable x.

Variable Assignment: x = 6; assigns the value 6 to the variable x.

DOM Manipulation: document.getElementById("demo").innerHTML = x; finds the element with id demo and sets its innerHTML to the value of x, which is 6.

Outcome:

The content of the HTML element with the id demo will be changed to 6.

References:

MDN Web Docs on getElementById

W3C JavaScript DOM Manipulation

Questions # 19:

Which layout method causes images to render to small or too large in browser windows of different sizes?

Options:

---

A.

Fluid

---

B.

Fixed width

---

C.

Liquid

---

D.

Relative width

---

Suggested Solution Expert Solution

Answer

B

Show Explanation

Explanation

A fixed-width layout method specifies exact pixel values for widths. This approach does not adapt to different screen sizes, leading to images rendering too small or too large on various devices.

Fixed Width Layout:

Definition: Uses specific pixel values for the width of elements.

Example:

container {

width: 800px;

}

Issues:

Lack of Flexibility: Does not scale with the size of the viewport, causing images and other elements to appear incorrectly sized on different screen sizes.

Comparison:

Fluid/Liquid: Adapts to the screen size using percentages or other relative units.

Relative Width: Also adapts using units like em or %.

References:

MDN Web Docs - Fixed vs. Fluid Layout

W3C CSS Flexible Box Layout Module Level 1

Using fixed-width layouts can result in poor user experience across different devices, highlighting the importance of responsive design principles.

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Questions # 20:

A javaScript programmer defines the following function:



What is the name of the function?

Options:

---

A.

Function

---

B.

Number

---

C.

Return

---

D.

square

---

Suggested Solution Expert Solution

Answer

D

Show Explanation

Explanation

In JavaScript, the name of a function is defined after the function keyword and before the parentheses that enclose its parameters.

Function Name: The function name is the identifier used to call the function. It is defined immediately after the function keyword.

Usage Example:

function square(number) {

return number * number;

}

In this example, the name of the function is square.

References:

MDN Web Docs on Functions

ECMAScript Language Specification

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