70-480日本語 無料問題集「Microsoft Programming in HTML5 with JavaScript and CSS3 (70-480日本語版)」
正解：
Explanation
* a img
All elements that are descendants of an element.
* (this).parent
This is the element and is the parent.
正解：
Explanation
Box 1:
Box 2:
Box 3:
* From Scenario: Do not allow other DOM elements to receive the event.
So: bubbles: false
* From scenario: Allow the event to be cancelled.
So: cancellable: true
* From scenario:
The webpage must contain an HTML element named ordersListing that will receive the custom event notification.
* Events which are designated as bubbling will initially proceed with the same event flow as non-bubbling events. The event is dispatched to its target EventTarget and any event listeners found there are triggered.
Bubbling events will then trigger any additional event listeners found by following the EventTarget's parent chain upward, checking for any event listeners registered on each successive EventTarget. This upward propagation will continue up to and including the Document. EventListeners registered as capturers will not be triggered during this phase. The chain of EventTargets from the event target to the top of the tree is determined before the initial dispatch of the event. If modifications occur to the tree during event processing, event flow will proceed based on the initial state of the tree.
Note:
* Ajax (an acronym for Asynchronous JavaScript and XML) is a group of interrelated web development techniques used on the client-side to create asynchronous web applications. With Ajax, web applications can send data to, and retrieve data from, a server asynchronously (in the background) without interfering with the display and behavior of the existing page. Data can be retrieved using the XMLHttpRequest object. Despite the name, the use of XML is not required (JSON is often used instead), and the requests do not need to be asynchronous.
正解：
Explanation
* What is the difference between call and apply?
apply lets you invoke the function with arguments as an array; call requires the parameters be listed explicitly.
Pseudo syntax:
theFunction.apply(valueForThis, arrayOfArgs)
theFunction.call(valueForThis, arg1, arg2, ...)
Reference: What is the difference between call and apply?
正解：
Explanation
* !arr[ctry] is true when the array element is false.
* The for..in statement iterates over the enumerable properties of an object, in arbitrary order. For each distinct property, statements can be executed.
Incorrect:
Not:
Would work fine if var i; would be replaced by i=0;
Reference: JavaScript Arrays; The for..in statement
正解：
Explanation
* From highest priority to lowest priority.
User important style sheets
Author important style sheets
Author normal style sheets
User normal style sheets
User agent style sheets
* CSS declarations are applied in this order (from lowest to highest priority):
* User agent declarations (the default styles your browser applies to elements)
* User normal declarations (a user's own stylesheet if they're using one)
* Author normal declarations (this is your normal stylesheet)
* Author important declarations (anything your mark important)
* User important declarations (any important styles from the user's stylesheet) Reference: Assigning property values, Cascading, and Inheritance; In what order do CSS definitions take priority
http://www.w3.org/TR/CSS21/cascade.html
http://www.quora.com/In-what-order-do-CSS-definitions-take-priority
正解：
Explanation
You can access object properties in two ways:
objectName.propertyName
or
objectName[propertyName]
Reference: JavaScript Objects
