Errata

"A cowpath is the rough, heavily trodden track that gets people from one point to another," should read, "A cowpath is the rough, heavily trodden track that gets cows from one point to another."

... datetime="2014-06-26" > January 26</time>

should be...

... datetime="2014-06-26" > June 26</time>

... datetime="PT1H" >40 min</time>

should be...

... datetime="PT1H" > 1 Hour </time>

Chrome(Top) should be Chrome (middle) and IE(middle) should be IE(top)

change:
All in all, <progress> and <scale> are minor conveniences that will be useful once their browser support improves just a bit.

yo <progress> and <meter> are...

Last line of code is width two times, should be width and height.

thix.y = 0;

in function:

function Circle() {
this.x = 0;
thix.y = 0;
this.radius = 15;
}

has to be corrected to be:

this.y = 0;

Missing starting curly bracket and comment should be on new line.

on page 355 step 7 add + '#newsItem' (no space before #)
s/b add + ' #newsItem' (space before #)

and page 356 in completed code example top of page
+ ' .newsItem' (space before .)
s/b + ' #newsItem' (space before #)

and in the example code complete_load.html

+ ' #newsItem' (space before "#")

on page 3 paragraph 2 lines up from step 8

like this: load(url + '#newsItem")
s/b load(url + ' #newItem') // space before the #

Line that says:

socket.onopen = connectionClosed;

is not logical, and it is a mistake.

So the correct version is:

socket.onclose = connectionClosed;

The text has <span>, but the example code uses a <p> element.

the CSS for linear-gradient, under FireFox 28.0 the 'from' keyword is not recognized (see https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient?redirectlocale=en-US&redirectslug=CSS%2Flinear-gradient)

To get the gradients to match those in Chrome display needed to use the following
for gradient2: background: linear-gradient(to left, lightblue, white); and
gradient3: background: linear-gradient(to top, violet 0%, yellow 20%, orange 80%, red 100%);