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Demonstrate how to make an element stick to the top when user scrolls down too much. Still correct when window is resized. At least work on Safari & Chrome (desktop)..
<html>
<head>
<title>Alice's Adventures in Wonderland -- Chapter I</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">
</script>
</head>
<body>
<h2>CHAPTER I</h2>
<h2>Down the Rabbit-Hole</h2>
Alice was beginning to get very tired of sitting by her sister on
the bank, and of having nothing to do: once or twice she had peeped
into the book her sister was reading, but it had no pictures or
conversations in it, `and what is the use of a book,' thought Alice
`without pictures or conversation?'
<p>
So she was considering in her own mind (as well as she could, for
the hot day made her feel very sleepy and stupid), whether the
pleasure of making a daisy-chain would be worth the trouble of
getting up and picking the daisies, when suddenly a White Rabbit
with pink eyes ran close by her.
</p>
<p>
There was nothing so <i>very</i> remarkable in that; nor did Alice
think it so <i>very</i> much out of the way to hear the Rabbit say
to itself, `Oh dear! Oh dear! I shall be late!' (when she
thought it over afterwards, it occurred to her that she ought to
have wondered at this, but at the time it all seemed quite
natural); but when the Rabbit actually <i>took a watch out of its
waistcoat</i>-<i>pocket</i>, and looked at it, and then hurried
on, Alice started to her feet, for it flashed across her mind that
she had never before seen a rabbit with either a waistcoat-pocket,
or a watch to take out of it, and burning with curiosity, she ran
across the field after it, and fortunately was just in time to see
it pop down a large rabbit-hole under the hedge.
</p>
<p id="testp">
<b>
<font color="red">White Rabbit checking watch (TESTING - FIXED HERE)</font>
</b>
</p>
<p>
In another moment down went Alice after it, never once considering
how in the world she was to get out again.
</p>
<p>
The rabbit-hole went straight on like a tunnel for some way, and
then dipped suddenly down, so suddenly that Alice had not a moment
to think about stopping herself before she found herself falling
down a very deep well.
</p>
<p>
Either the well was very deep, or she fell very slowly, for she
had plenty of time as she went down to look about her and to
wonder what was going to happen next. First, she tried to look
down and make out what she was coming to, but it was too dark to
see anything; then she looked at the sides of the well, and
noticed that they were filled with cupboards and book-shelves;
here and there she saw maps and pictures hung upon pegs. She took
down a jar from one of the shelves as she passed; it was labelled
`ORANGE MARMALADE', but to her great disappointment it was empty:
she did not like to drop the jar for fear of killing somebody, so
managed to put it into one of the cupboards as she fell past it.
</p>
<p>
`Well!' thought Alice to herself, `after such a fall as this, I
shall think nothing of tumbling down stairs! How brave they'll
all think me at home! Why, I wouldn't say anything about it, even
if I fell off the top of the house!' (Which was very likely true.)
</p>
<p>
Down, down, down. Would the fall <i>never</i> come to an end! `I
wonder how many miles I've fallen by this time?' she said aloud.
`I must be getting somewhere near the centre of the earth. Let me
see: that would be four thousand miles down, I think--' (for, you
see, Alice had learnt several things of this sort in her lessons
in the schoolroom, and though this was not a <i>very</i> good
opportunity for showing off her knowledge, as there was no one to
listen to her, still it was good practice to say it over) `--yes,
that's about the right distance--but then I wonder what Latitude
or Longitude I've got to?' (Alice had no idea what Latitude was,
or Longitude either, but thought they were nice grand words to
say.)
</p>
<p>
Presently she began again. `I wonder if I shall fall right
<i>through</i> the earth! How funny it'll seem to come out among
the people that walk with their heads downward! The Antipathies,
I think--' (she was rather glad there <i>was</i> no one listening,
this time, as it didn't sound at all the right word) `--but I
shall have to ask them what the name of the country is, you know.
Please, Ma'am, is this New Zealand or Australia?' (and she tried
to curtsey as she spoke--fancy <i>curtseying</i> as you're falling
through the air! Do you think you could manage it?) `And what an
ignorant little girl she'll think me for asking! No, it'll never
do to ask: perhaps I shall see it written up somewhere.'
</p>
<p>
Down, down, down. There was nothing else to do, so Alice soon
began talking again. `Dinah'll miss me very much to-night, I
should think!' (Dinah was the cat.) `I hope they'll remember her
saucer of milk at tea-time. Dinah my dear! I wish you were down
here with me! There are no mice in the air, I'm afraid, but you
might catch a bat, and that's very like a mouse, you know. But do
cats eat bats, I wonder?' And here Alice began to get rather
sleepy, and went on saying to herself, in a dreamy sort of way,
`Do cats eat bats? Do cats eat bats?' and sometimes, `Do bats eat
cats?' for, you see, as she couldn't answer either question, it
didn't much matter which way she put it. She felt that she was
dozing off, and had just begun to dream that she was walking hand
in hand with Dinah, and saying to her very earnestly, `Now, Dinah,
tell me the truth: did you ever eat a bat?' when suddenly, thump!
thump! down she came upon a heap of sticks and dry leaves, and the
fall was over.
</p>
<p>
Alice was not a bit hurt, and she jumped up on to her feet in a
moment: she looked up, but it was all dark overhead; before her
was another long passage, and the White Rabbit was still in sight,
hurrying down it. There was not a moment to be lost: away went
Alice like the wind, and was just in time to hear it say, as it
turned a corner, `Oh my ears and whiskers, how late it's getting!'
She was close behind it when she turned the corner, but the Rabbit
was no longer to be seen: she found herself in a long, low hall,
which was lit up by a row of lamps hanging from the roof.
</p>
<p>
There were doors all round the hall, but they were all locked; and
when Alice had been all the way down one side and up the other,
trying every door, she walked sadly down the middle, wondering how
she was ever to get out again.
</p>
<p>
Suddenly she came upon a little three-legged table, all made of
solid glass; there was nothing on it except a tiny golden key, and
Alice's first thought was that it might belong to one of the doors
of the hall; but, alas! either the locks were too large, or the
key was too small, but at any rate it would not open any of them.
However, on the second time round, she came upon a low curtain she
had not noticed before, and behind it was a little door about
fifteen inches high: she tried the little golden key in the lock,
and to her great delight it fitted!
</p>
<p>
<b>Alice finding tiny door behind curtain</b>
</p>
<p>
Alice opened the door and found that it led into a small passage,
not much larger than a rat-hole: she knelt down and looked along
the passage into the loveliest garden you ever saw. How she
longed to get out of that dark hall, and wander about among those
beds of bright flowers and those cool fountains, but she could not
even get her head though the doorway; `and even if my head would
go through,' thought poor Alice, `it would be of very little use
without my shoulders. Oh, how I wish I could shut up like a
telescope! I think I could, if I only know how to begin.' For,
you see, so many out-of-the-way things had happened lately, that
Alice had begun to think that very few things indeed were really
impossible.
</p>
<p>
There seemed to be no use in waiting by the little door, so she
went back to the table, half hoping she might find another key on
it, or at any rate a book of rules for shutting people up like
telescopes: this time she found a little bottle on it, (`which
certainly was not here before,' said Alice,) and round the neck of
the bottle was a paper label, with the words `DRINK ME'
beautifully printed on it in large letters.
</p>
<p>
<b>Alice taking "Drink Me" bottle</b>
</p>
<p>
It was all very well to say `Drink me,' but the wise little Alice
was not going to do <i>that</i> in a hurry. `No, I'll look
first,' she said, `and see whether it's marked "poison" or not';
for she had read several nice little histories about children who
had got burnt, and eaten up by wild beasts and other unpleasant
things, all because they <i>would</i> not remember the simple
rules their friends had taught them: such as, that a red-hot poker
will burn you if you hold it too long; and that if you cut your
finger <i>very</i> deeply with a knife, it usually bleeds; and she
had never forgotten that, if you drink much from a bottle marked
`poison,' it is almost certain to disagree with you, sooner or
later.
</p>
<p>
However, this bottle was <i>not</i> marked `poison,' so Alice
ventured to taste it, and finding it very nice, (it had, in fact,
a sort of mixed flavour of cherry-tart, custard, pine-apple, roast
turkey, toffee, and hot buttered toast,) she very soon finished it
off.
</p>
<pre> * * * * * * *
* * * * * *
* * * * * * *
</pre>
`What a curious feeling!' said Alice; `I must be shutting up like a
telescope.'
<p>
And so it was indeed: she was now only ten inches high, and her
face brightened up at the thought that she was now the right size
for going through the little door into that lovely garden. First,
however, she waited for a few minutes to see if she was going to
shrink any further: she felt a little nervous about this; `for it
might end, you know,' said Alice to herself, `in my going out
altogether, like a candle. I wonder what I should be like then?'
And she tried to fancy what the flame of a candle is like after
the candle is blown out, for she could not remember ever having
seen such a thing.
</p>
<p>
After a while, finding that nothing more happened, she decided on
going into the garden at once; but, alas for poor Alice! when she
got to the door, she found she had forgotten the little golden
key, and when she went back to the table for it, she found she
could not possibly reach it: she could see it quite plainly
through the glass, and she tried her best to climb up one of the
legs of the table, but it was too slippery; and when she had tired
herself out with trying, the poor little thing sat down and cried.
</p>
<p>
`Come, there's no use in crying like that!' said Alice to herself,
rather sharply; `I advise you to leave off this minute!' She
generally gave herself very good advice, (though she very seldom
followed it), and sometimes she scolded herself so severely as to
bring tears into her eyes; and once she remembered trying to box
her own ears for having cheated herself in a game of croquet she
was playing against herself, for this curious child was very fond
of pretending to be two people. `But it's no use now,' thought
poor Alice, `to pretend to be two people! Why, there's hardly
enough of me left to make <i>one</i> respectable person!'
</p>
<p>
Soon her eye fell on a little glass box that was lying under the
table: she opened it, and found in it a very small cake, on which
the words `EAT ME' were beautifully marked in currants. `Well,
I'll eat it,' said Alice, `and if it makes me grow larger, I can
reach the key; and if it makes me grow smaller, I can creep under
the door; so either way I'll get into the garden, and I don't care
which happens!'
</p>
<p>
She ate a little bit, and said anxiously to herself, `Which way?
Which way?', holding her hand on the top of her head to feel which
way it was growing, and she was quite surprised to find that she
remained the same size: to be sure, this generally happens when
one eats cake, but Alice had got so much into the way of expecting
nothing but out-of-the-way things to happen, that it seemed quite
dull and stupid for life to go on in the common way.
</p>
<p>
So she set to work, and very soon finished off the cake.
</p>
<pre> * * * * * * *
* * * * * *
* * * * * * *
</pre>
<script>
var original = $("#testp").offset().top;
$(window).resize(function() {
// keep latest original vertical offset value
original = $("#testp").offset().top;
});
$(window).scroll(function () {
var vtop = $(document).scrollTop();
if(vtop >= original) {
// the element should have disappeared, make it stick to top
$("#testp").css("position","fixed");
$("#testp").offset({top:0});
} else{
// the element is in the page again, make it normal
$("#testp").css("position","static");
}
});
</script>
</body>
</html>
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