Errors and Omissions
p. 55, Test Question 5. This exercise should be restricted to lossless compression.
p. 98, Test Question 4. This question should start: In Figure 3.24, which of the two lower shapes …
p. 557. In the 3rd line of the code fragment in the middle of the page there is a superfluous
. between the
p. 560ff. (This isn't exactly an error, but we advise you to make the following changes to be consistent with the behaviour of popular Web browsers.) Change the first paragraph of the section headed "Events and Listeners" to the following:
addEventListeneris an example of a method that takes a function as one of its arguments.
addEventListenertakes three arguments. The first is a string, whose value is the name of an event; the second is a function which will act as the listener for events of that type. We use the function’s name only, because we are passing the function object, not calling it. For simple cases, the third argument is always
This change reflects the behaviour of the current versions of Firefox and Opera, which consider omitting the final argument to be an error. Safari allows it to be omitted, which appears to be the behaviour specified in the ECMAScript standard. (Internet Explorer does not implement
addEventListener at all.) For consistency, the third argument should be added to the calls of
p. 560. 5 lines from the bottom, change to
switch1.addEventListener("click", plainify, false)
p. 563. Change the two calls in the function
switch1.addEventListener("click", plainify, false) switch2.addEventListener("click", fancify, false)and the call below it to
window.addEventListener("load", prepare, false)
p. 565. Change the call at the end of
the_switch.addEventListener("click", the_listener, false)
p. 574. Add at the end of the last sentence: ", but the third argument can be omitted."
p 608. Add the following before the
polyline element on the last line:
<circle cx="50" cy="50" r="50" fill="#F67155" stroke="none" />
p. 622, Test Question 9. This question may need some clarification. Change the first sentence to:
Show how you can use a combination of transforms in SVG to scale a 300 × 400 pixel rectangle with a red fill, whose top left corner is at (150, 200), by a factor of 1.5, without altering the position of the top left corner.
p. 683. Insert the entry for "colour values" between "colour table" and "colour wheel".