70-480 Exam
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Q21. You are troubleshooting an application. Users report that the UI is slow to respond.
You need to improve UI responsiveness by moving application tasks to web workers.
Which two tasks can you move to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
A. A function that loops through the Document Object Model to update the style of page elements
B. A long-running calculation that requires looping through an array
C. A function that performs graphic-intensive animation
D. A function that stores large amounts of data to local storage
Answer: BC
Q22. You are developing a web application that consumes services from a third-party application. A web worker processes the third-party application requests in the background. A page in the application instantiates the web worker process.
You need to establish two-way communications between the web worker process and the page.
Which two actions will achieve this goal? (Each correct answer presents a complete solution. Choose two.)
A. From the web worker, use the onconnect event handler of the main page to capture events.
B. From the main page, use the onmessage event handler of the web worker to capture events.
C. From the web worker, use the onmessage event handler of the main page to capture events.
D. From the main page, use the onconnect event handler of the web worker to capture events.
Answer: BC
Q23. You need to test the value of the following variable in JavaScript.
var length = "75";
A block of code must execute if the length equals 75 regardless of the data type.
You need to use the statement that meets this requirement.
Which lines of code should you use? (Each correct answer presents a complete solution. Choose two.)
A. if (length = = = 75)
B. if (length = = 75)
C. if (length! = 75)
D. if (length = = "75")
Answer: BD
Q24. You are creating a JavaScript function to display the current version of a web application
You declare a button as follows.
<input type="button" id="About" value="About" />
You need to create an event handler for the button by using an anonymous function.
Which code segment should you use?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: C
Q25. You are developing a customer web form that includes the following HTML.
<input id = "txtValue" />
A customer must enter a value in the text box prior to submitting the form.
You need to add validation to the text box control.
Which HTML should you use?
A. <input id="txtValue" type="text" required="required"/>
B. <input id="txtValue" type="text" pattern="[A-Za-z]{3}" />
C. <input id="txtValue" type="required" />
D. <input id="txtValue" type="required" autocomplete="on" />
Answer: A
Q26. You are developing an HTML5 web application for a surveyor company that displays topographic images.
The application must:
Display the topographic images at different zoom levels without loss of detail Print the topographic images without loss of detail Work from only one source file for each topographic image
You need to ensure that the topographic images display according to the requirements.
Which HTML5 element should you use?
A. SVG
B. CANVAS
C. SAMP
D. AREA
Answer: A
Q27. You are developing a blog web page that is being optimized for accessibility. The page includes the following HTML.
The heading tags represent a blog post title, a blog post subtitle, and the author's name.
You need to ensure that the three headings are treated as a unit but retain their individual formatting.
Which tags should you use to wrap the H1, H2, and H3 elements?
A. <group> </group>
B. <header> </header>
C. <hgroup> </hgroup>
D. <headings> </headings>
Answer: C
Q28. You are developing an HTML5 web application and are styling text.
You need to use the text-transform CSS property.
Which value is valid for the text-transform property?
A. Capitalize
B. Red
C. 20px
D. Italic
Answer: A
Q29. You are modifying a website. The body of the page will be divided into two sections: . A content section will contain blog posts and comments. . An area on the right-hand side will contain advertisements. The page is defined by the following HTML.
The site must conform to HTML5 standards and must use HTML5 semantic tags. You need to ensure that the advertisements are on the rightmost section of the page. Which tag should you use?
A. <aside>
B. <div>
C. <article>
D. <footer>
Answer: A
Q30. You are developing an HTML5 web application. The application loads data from a web service by using AJAX. The application displays the data by calling the displayData function. The data is loaded by using the following code.
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B