Basics of Web Design: Html5 & Css3
4th Edition
ISBN: 9780134444338
Author: Terry Felke-Morris
Publisher: PEARSON
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Expert Solution & Answer
Chapter 8, Problem 1RQ
Program Description Answer
Viewport is the visible area of a webpage for a user . The Meta tag used to configure display for mobile devices is Viewport.
Hence, the correct answer is option “A”.
Expert Solution & Answer
Explanation of Solution
Tag used to configure mobile devices:
- The webpages designed for computer resolution cannot be viewed the same way on a mobile device.
- Once the viewport tag is configured, the page can be zoomed and scaled to a width that is easy for a user to read.
- The “<meta>” tag is used to let web designers take control over the viewport.
In HTML 5, it can be used as:
<meta name="viewport" content="width=device-width, initial-scale=1.0">
Here,
- The “<meta>” gives instructions to the browser to control the page dimension and scaling.
- “width=device-width” is used to set the width of the page similar to the screen width of the mobile device.
- The “initial-scale=1.0” sets the zoom level when the browser loads the page.
Explanation for incorrect options:
Handheld:
Handheld value informs the server that the user has optimized the page and the optimized version can be viewed using a mobile device. It is not used to configure display for mobile devices.
Hence, option “B” is wrong.
Mobile:
There is no mobile tag present in HTML to configure display for mobile devices.
Hence, option “C” is wrong.
Screen:
There is no screen tag present in HTML to configure display for mobile devices.
Hence, option “D” is wrong.
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Students have asked these similar questions
Consider the following relational schema and briefly answer the questions that follow:
Emp(eid: integer, ename: string, age: integer, salary: real)
Works(eid: integer, did: integer, pct_time: integer)
Dept(did: integer, budget: real, managerid: integer)
a. Define a table constraint on Dept that will ensure that all managers have age > 30.
b. Write SQL statements to delete all information about employees whose salaries exceed that of the manager of one or more departments that they work in. Be sure to ensure that all the relevant integrity constraints are satisfied after your updates.
Consider the following relations:
Student(snum: integer, sname: string, rmajor: string,
level: string, age: integer)
Class(cname: string, meets_at: time, room: string, fid: integer)
Enrolled(snum: integer, cname: string)
Faculty(fid: integer, fname: string, deptid: integer)
The meaning of these relations is straightforward; for example, Enrolled has one record per student-class pair such that the student is enrolled in the class.
2. Express each of the following integrity constraints in SQL unless it is implied by the primary and foreign key constraint; if so, explain how it is implied. If the constraint cannot be expressed in SQL, say so. For each constraint, state what operations (inserts, deletes, and updates on specific relations) must be monitored to enforce the constraint.
(a) Every faculty member must teach at least two courses.
(b) Every student must be enrolled in the course called 'Math101'.
(c) A student cannot add more than two courses at a time…
Consider the following relational schema. An employee can work in more than one department; the pct_time field of the Works relation shows the percentage of time that a given employee works in a given department.
Emp(eid: integer, ename: string, age: integer, salary: real)
Works(eid: integer, did: integer, pct_time: integer)
Dept(did: integer, budget: real, managerid: integer)
Write the following queries in SQL:
a. Print the name of each employee whose salary exceeds the budget of all of the departments that he or she works in.
b. Find the enames of managers who manage only departments with budgets larger than $1 million, but at least one department with budget less than $5 million.
Chapter 8 Solutions
Basics of Web Design: Html5 & Css3
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