<img> placed in unexpected position

bgold12

Hey, I've come across a strange behaviour that shows itself in IE 7.0
and Firefox 3 and probably other browsers.

In the code below, which is a complete HTML document which validates
as XHTML 1.0 Strict, I display an image named Images/DivLine1.jpg
(which is a simple 1x5 pixel blue line) inside two divs across 100% of
their width, the first of which has 50px height and the second of
which has 100px height. In both cases, I set the image to vertical-
align:bottom, and I expect the image to rest against the bottom of the
div box. But in each case, the bottom of the image is displayed at
(apparently) exactly 20 pixels from the top of the div. What is going
on?

--------------------code--------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
<title>Test</title>
</head>

<body>

<div style="backgrou nd-color:red; height:50px;">< img src="Images/
DivLine1.jpg" alt="DivLine1" width="100%" height="5px" style="vertical-
align:bottom" /></div>
<div><br /></div>

<div style="backgrou nd-color:red; height:100px;"> <img src="Images/
DivLine1.jpg" alt="DivLine1" width="100%" height="5px" style="vertical-
align:bottom" /></div>

</body>

</html>
--------------------code--------------------

Thanks,

bgold12

Aug 18 '08 #1

Subscribe Reply

1989

dorayme

In article
<93************ *************** *******@m73g200 0hsh.googlegrou ps.com>,
bgold12 <bg*****@gmail. comwrote:

Hey, I've come across a strange behaviour that shows itself in IE 7.0
and Firefox 3 and probably other browsers.

In the code below, which is a complete HTML document which validates
as XHTML 1.0 Strict, I display an image named Images/DivLine1.jpg
(which is a simple 1x5 pixel blue line) inside two divs across 100% of
their width, the first of which has 50px height and the second of
which has 100px height. In both cases, I set the image to vertical-
align:bottom, and I expect the image to rest against the bottom of the
div box. But in each case, the bottom of the image is displayed at
(apparently) exactly 20 pixels from the top of the div. What is going
on?

--------------------code------

There are many things to puzzle about with inline images, what quite is
puzzling you about

<http://netweaver.com.a u/alt/inlineImages/twoDivs.html>

It will help you to see what is going on if you keep changing the text
size (up the point of the text wrapping)

--
dorayme

Aug 18 '08 #2

dorayme

In article <do************ *************** *******@web.aio e.org>,
dorayme <do************ @optusnet.com.a uwrote:

In article
<93************ *************** *******@m73g200 0hsh.googlegrou ps.com>,
bgold12 <bg*****@gmail. comwrote:

Hey, I've come across a strange behaviour that shows itself in IE 7.0
and Firefox 3 and probably other browsers.

In the code below, which is a complete HTML document which validates
as XHTML 1.0 Strict, I display an image named Images/DivLine1.jpg
(which is a simple 1x5 pixel blue line) inside two divs across 100% of
their width, the first of which has 50px height and the second of
which has 100px height. In both cases, I set the image to vertical-
align:bottom, and I expect the image to rest against the bottom of the
div box. But in each case, the bottom of the image is displayed at
(apparently) exactly 20 pixels from the top of the div. What is going
on?

--------------------code------

There are many things to puzzle about with inline images, what quite is
puzzling you about

<http://netweaver.com.a u/alt/inlineImages/twoDivs.html>

It will help you to see what is going on if you keep changing the text
size (up the point of the text wrapping)

make that

<http://netweaver.com.a u/alt/inlineImages/twoDivs.html>

for an extra one with a div given a height. Remember that an inline
image is a bit like a bit of type, it will start whee the text line
boxes start in a div, left and top and the div will normally grow height
to accommodate. If you give the div a height, the height is not
necessirly used. The vertical-align instruction is not with respect to
the div but to the line box in which text sits. Images can be very tall
(like a big capital P).

--
dorayme

Aug 18 '08 #3

bgold12

Alright, I solved it.

Apparently the CSS statement "vertical-align:bottom;" aligns the image
to the bottom of the element's line-height, not it's height. Although
I set the height of the first div to 50px and the height of the second
div to 100px, the line-height of each div was 20px, so when I set the
image to vertical-align:bottom, it aligned the bottom edge of the
image to 20px from the top of the div (i.e. at the line-height).

bgold12

Aug 18 '08 #4

Andy Dingley

On 18 Aug, 06:09, bgold12 <bgol...@gmail. comwrote:

In the code below, which is a complete HTML document which validates
as XHTML 1.0 Strict,

* * * * <div style="backgrou nd-color:red; height:100px;"> <img src="Images/
DivLine1.jpg" alt="DivLine1" width="100%" height="5px" style="vertical-
align:bottom" /></div>

It might be valid, but it doesn't conform to the HTML recommendation.
width and height attributes on an image are a legacy from old
presentational HTML and use their own way of indicating units, not the
same as CSS lengths. width="100%" is OK, but height="5px" should just
be height="5" Once you're using non-conformant code like this,
anything could happen. The first step in investigating such issues,
particularly when there's a variation across browsers, is to make sure
the code is _perfect_.

Aug 18 '08 #5

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