HTML and CSS Reference
In-Depth Information
Correct answer:
B
3.
Incorrect:
The DOM is dynamic and changes physically when items are removed
from it.
A.
Correct:
When an element is removed and needed again, a reference to the
removed node must be kept to be able to add it back.
B.
Incorrect:
No such method exists.
C.
Incorrect:
A node can be added back to the DOM if a reference was kept. This is
accomplished by using the various methods available to insert nodes in the DOM.
D.
Correct answer:
C
4.
Incorrect:
Different browsers support different media formats. Use the
<source>
element to provide the media in the various formats.
A.
Incorrect:
The
src
attribute allows you to specify only one source video. This
doesn't work across multiple browsers unless the video format is supported across
the browsers.
B.
Correct:
The
<source>
elements specify multiple video formats so that the
browser can choose the correct one.
C.
Incorrect:
The
<object>
element is supported to provide a fallback mechanism in
the event that the browser doesn't support the HTML5
<video>
element.
D.
Correct answer:
C
5.
Incorrect:
The
moveTo
method moves the current context to a new point but
doesn't begin a drawing.
A.
Incorrect:
The
lineAt
method draws a line within the current positional context.
B.
Correct:
The
beginPath
method tells the context to start a new drawing from its
current point.
C.
Incorrect:
The
stroke
method tells the context to draw the graphics that are
applied to the context.
D.
Correct answer:
C
6.
Incorrect:
The
<canvas>
element doesn't support any declarative elements.
A.
Incorrect:
The
<svg>
element has poorer performance than the
<canvas>
element when a lot of graphic refresh is required.
B.
Correct:
The
<canvas>
element provides superior performance compared to the
<svg>
element.
C.
Incorrect:
The
<canvas>
and
<svg>
elements combined don't provide better
performance. The
<canvas>
element provides superior performance when the
graphics require a lot of refreshing.
D.
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