Microsoft Programming in HTML5 with JavaScript and CSS3 (070-480日本語版) - 070-480日本語 Exam Practice Test

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Explanation

The disabled property sets or returns whether an email field should be disabled, or not.
A disabled element is unusable and un-clickable. Disabled elements are usually rendered in gray by default in browsers.
Example
Disable an email field:
document.getElementById("myEmail").disabled = true;
Reference: Input Email disabled Property

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Explanation
Box 1:

Box 2:

Box 3:

Box 4:

Box 5:

first
Selects the first matched element.
Reference: :first Selector

Explanation
Box 1: var img = document.createElement('img');
Box 2: img:alt = image.Description;
img src = image.FileName;
Box 3: return this.img;
Note:
* Image Object
The Image object represents an embedded image.
For each <img> tag in an HTML document, an Image object is created.
Notice that images are not technically inserted into an HTML page, images are linked to HTML pages. The
<img> tag creates a holding space for the referenced image.
* Image Object Properties include
alt, Sets or returns the value of the alt attribute of an image
src, Sets or returns the value of the src attribute of an image

Explanation

Boat: Red
Car: Blue
Plane: Violet

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