Chrome vs. box-sizing:border-box in a display:table - html

I'm doing a small 2-pane layout using display:table. For spacing (also from the background image), I use padding. As I need the children to have an exact width:50% from the available space (taking regard for the padding of the parent div), I use box-sizing:border-box.
This works fine in Opera, but in Chrome the box-sizing:border-box or even -webkit-box-sizing:border-box is silently ignored.
I made a demo which shows the issue. The two red boxes should be square and the blue box should be 200px in width and height: http://jsfiddle.net/fabb/JKECK/
Here's the html source:
<div id="table">
<div id="left">
Something on the left side
</div>
<div id="right">
Something on the right side
</div>
</div>
And the css:
#table {
display: table;
/*border-collapse: collapse;*/
width: 200px !important;
height: 200px !important;
box-sizing: border-box;
-webkit-box-sizing:border-box;
-moz-box-sizing:border-box;
margin: 0;
border: 1px solid blue;
padding: 60px 20px;
}
#table #left, #table #right {
display: table-cell;
width: 50%;
box-sizing: border-box;
-webkit-box-sizing:border-box;
-moz-box-sizing:border-box;
margin: 0;
border: 1px solid red;
padding: 0;
}
Is this a bug in Chrome? Or am I doing something wrong?

Yes, Google chrome bug:
Issue #103543 - CSS display: table bug
Some case may be resolved by addding/removing specific side of padding (like the jsfiddle in the bug report), but your case may not be possible.
It is easier and more stable by using float there, if width and height is known and you want square cells.
Note:
Since table layout have the ability to break the assigned css width/height, it is better not using it unless it is table-like structure or you want to contents expand the container - so your !important in width & height is not working.

Remove -webkit- for chrome browser.

Related

When i use DOCTYPE in my code, it breaks my right padding. How can I fix this? [duplicate]

I have the following CSS and HTML snippet being rendered.
textarea
{
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
}
<div style="display: block;" id="rulesformitem" class="formitem">
<label for="rules" id="ruleslabel">Rules:</label>
<textarea cols="2" rows="10" id="rules"></textarea>
</div>
Is the problem is that the text area ends up being 8px wider (2px for border + 6px for padding) than the parent. Is there a way to continue to use border and padding but constrain the total size of the textarea to the width of the parent?
Why not forget the hacks and just do it with CSS?
One I use frequently:
.boxsizingBorder {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
See browser support here.
The answer to many CSS formatting problems seems to be "add another <div>!"
So, in that spirit, have you tried adding a wrapper div to which the border/padding are applied and then putting the 100% width textarea inside of that? Something like (untested):
textarea
{
width:100%;
}
.textwrapper
{
border:1px solid #999999;
margin:5px 0;
padding:3px;
}
<div style="display: block;" id="rulesformitem" class="formitem">
<label for="rules" id="ruleslabel">Rules:</label>
<div class="textwrapper"><textarea cols="2" rows="10" id="rules"/></div>
</div>
let's consider the final output rendered to the user of what we want to achieve: a padded textarea with both a border and a padding, which characteristics are that being clicked they pass the focus to our textarea, and the advantage of an automatic 100% width typical of block elements.
The best approach in my opinion is to use low level solutions as far as possible, to reach the maximum browsers support.
In this case the only HTML could work fine, avoiding the use of Javascript (which anyhow we all love).
The LABEL tag comes in our help because has such behaviour and is allowed to contain the input elements it must address to.
Its default style is the one of inline elements, so, giving to the label a block display style we can avail ourselves of the automatic 100% width including padding and borders, while the inner textarea has no border, no padding and a 100% width.
Taking a look at the W3C specifics other advantages we may notice are:
no "for" attribute is needed: when a LABEL tag contains the target input, it automatically focuses the child input when clicked;
if an external label for the textarea has already been designed, no conflicts occur, since a given input may have one or more labels.
See W3C specifics for more detailed information.
Simple example:
.container {
width: 400px;
border: 3px
solid #f7c;
}
.textareaContainer {
display: block;
border: 3px solid #38c;
padding: 10px;
}
textarea {
width: 100%;
margin: 0;
padding: 0;
border-width: 0;
}
<body>
<div class="container">
I am the container
<label class="textareaContainer">
<textarea name="text">I am the padded textarea with a styled border...</textarea>
</label>
</div>
</body>
The padding and border of the .textareaContainer elements are the ones we want to give to the textarea. Try editing them to style it as you want.
I gave large and visible padding and borders to the .textareaContainer element to let you see their behaviour when clicked.
If you're not too bothered about the width of the padding, this solution will actually keep the padding in percentages too..
textarea
{
border:1px solid #999999;
width:98%;
margin:5px 0;
padding:1%;
}
Not perfect, but you'll get some padding and the width adds up to 100% so its all good
I came across another solution here that is so simple: add padding-right to the textarea's container. This keeps the margin, border, and padding on the textarea, which avoids the problem that Beck pointed out about the focus highlight that chrome and safari put around the textarea.
The container's padding-right should be the sum of the effective margin, border, and padding on both sides of the textarea, plus any padding you may otherwise want for the container. So, for the case in the original question:
textarea{
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
}
.textareacontainer{
padding-right: 8px; /* 1 + 3 + 3 + 1 */
}
<div class="textareacontainer">
<textarea></textarea>
</div>
This table hack code works for me in all browsers from IE8+
<td>
<textarea style="width:100%" rows=3 name="abc">Modify width:% accordingly</textarea>
</td>
I was looking for an inline-styling solution instead of CSS solution, and this is the best I can go for a responsive textarea:
<div style="width: 100%; max-width: 500px;">
<textarea style="width: 100%;"></textarea>
</div>
The problem lies in the box-sizing property.
By default, the initial value of the box-sizing property is content-box.
so you have something like this under the hood:
textarea {
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
box-sizing: content-box;
}
box-sizing: content-box; means that the width of the actual element is equal to the width of the element's content box.
so when you add padding (in this case padding-right and padding-left --> because we are talking about width) and border (in this case border-right and border-left --> because we are talking about width), these values get added to the final width. so your element will be wider than you want.
set it to box-sizing: border-box;. so the width will be calculated like so:
horizontal border + horizontal padding + width of content box = width
in this case, when you add horizontal border and horizontal padding, the final width of element does not change, in fact, the content box will shrink to satisfy the equation.
You can make use of the box-sizing property, it's supported by all the main standard-compliant browsers and IE8+. You still will need a workaround for IE7 though. Read more here.
No, you cannot do that with CSS. That is the reason Microsoft initially introduced another, and maybe more practical box model. The box model that eventually won, makes it inpractical to mix percentages and units.
I don't think it is OK with you to express padding and border widths in percentage of the parent too.
If you pad and offset it like this:
textarea
{
border:1px solid #999999;
width:100%;
padding: 7px 0 7px 7px;
position:relative; left:-8px; /* 1px border, too */
}
the right side of the textarea perfectly aligns with the right side of the container, and the text inside the textarea aligns perfectly with the body text in the container... and the left side of the textarea 'sticks out' a bit. it's sometimes prettier.
For people who use Bootstrap, textarea.form-control can lead to textarea sizing issues as well. Chrome and Firefox appear to use different heights with the following Bootstrap CSS:
textarea.form-conrtol{
height:auto;
}
I often fix that problem with calc(). You just give the textarea a width of 100% and a certain amount of padding, but you have to subtract the total left and right padding of the 100% width you have given to the textarea:
textarea {
border: 0px;
width: calc(100% -10px);
padding: 5px;
}
Or if you want to give the textarea a border:
textarea {
border: 1px;
width: calc(100% -12px); /* plus the total left and right border */
padding: 5px;
}
How about negative margins?
textarea {
border:1px solid #999999;
width:100%;
margin:5px -4px; /* 4px = border+padding on one side */
padding:3px;
}
The value of the padding has a role to play. Using the style you posted:
textarea {
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
}
The width is already filled up and you have padding left, right to be 3px. So there will be an overflow.
If you change your style to this:
textarea
{
border:1px solid #999999;
width:98%;
margin:5px 0;
padding: 3px 1%;
}
What my styling is doing now is it has a width of 98% and its remaining 2% to complete a 100% and that is why I gave padding left 1% and padding right 1%. With this, the issue of overflow should be fixed

Inline css add style issue [duplicate]

I have an html input.
The input has padding: 5px 10px; I want it to be 100% of the parent div's width(which is fluid).
However using width: 100%; causes the input to be 100% + 20px how can I get around this?
Example
box-sizing: border-box is a quick, easy way to fix it:
This will work in all modern browsers, and IE8+.
Here's a demo: http://jsfiddle.net/thirtydot/QkmSk/301/
.content {
width: 100%;
box-sizing: border-box;
}
The browser prefixed versions (-webkit-box-sizing, etc.) are not needed in modern browsers.
This is why we have box-sizing in CSS.
I’ve edited your example, and now it works in Safari, Chrome, Firefox, and Opera. Check it out: http://jsfiddle.net/mathias/Bupr3/
All I added was this:
input {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
Unfortunately older browsers such as IE7 do not support this. If you’re looking for a solution that works in old IEs, check out the other answers.
Use padding in percentages too and remove from the width:
padding: 5%;
width: 90%;
You can do it without using box-sizing and not clear solutions like width~=99%.
Demo on jsFiddle:
Keep input's padding and border
Add to input negative horizontal margin = border-width + horizontal padding
Add to input's wrapper horizontal padding equal to margin from previous step
HTML markup:
<div class="input_wrap">
<input type="text" />
</div>
CSS:
div {
padding: 6px 10px; /* equal to negative input's margin for mimic normal `div` box-sizing */
}
input {
width: 100%; /* force to expand to container's width */
padding: 5px 10px;
border: none;
margin: 0 -10px; /* negative margin = border-width + horizontal padding */
}
Use css calc()
Super simple and awesome.
input {
width: -moz-calc(100% - 15px);
width: -webkit-calc(100% - 15px);
width: calc(100% - 15px);
}​
As seen here: Div width 100% minus fixed amount of pixels
By webvitaly (https://stackoverflow.com/users/713523/webvitaly)
Original source: http://web-profile.com.ua/css/dev/css-width-100prc-minus-100px/
Just copied this over here, because I almost missed it in the other thread.
Assuming i'm in a container with 15px padding, this is what i always use for the inner part:
width:auto;
right:15px;
left:15px;
That will stretch the inner part to whatever width it should be less the 15px either side.
Here is the recommendation from codeontrack.com, which has good solution examples:
Instead of setting the width of the div to 100%, set it to auto, and be sure, that the <div> is set to display: block (default for <div>).
You can try some positioning tricks. You can put the input in a div with position: relative and a fixed height, then on the input have position: absolute; left: 0; right: 0;, and any padding you like.
Live example
Move the input box' padding to a wrapper element.
<style>
div.outer{ background: red; padding: 10px; }
div.inner { border: 1px solid #888; padding: 5px 10px; background: white; }
input { width: 100%; border: none }
</style>
<div class="outer">
<div class="inner">
<input/>
</div>
</div>
See example here: http://jsfiddle.net/L7wYD/1/
Maybe browsers have changed since this question was last answered, but this is the only thing that has ever worked reliably for me to accomplish this:
width: auto;
left: 0;
right: 0;
Then you can make the margins / padding anything you want and the element will not expand past its available width.
This is similar to #andology's answer from way back but if you make left/right both 0 then you can make margin and/or padding whatever you want. So this is always my default div.
Just understand the difference between width:auto; and width:100%;
Width:auto; will (AUTO)MATICALLY calculate the width in order to fit the exact given with of the wrapping div including the padding.
Width 100% expands the width and adds the padding.
What about wrapping it in a container. Container shoud have style like:
{
width:100%;
border: 10px solid transparent;
}
Try this:
width: 100%;
box-sizing: border-box;
For me, using margin:15px;padding:10px 0 15px 23px;width:100%, the result was this:
The solution for me was to use width:auto instead of width:100%. My new code was:
margin:15px;padding:10px 0 15px 23px;width:auto. Then the element aligned properly:
You can do this:
width: auto;
padding: 20px;

Please help I am having a problem with 4 lines html css code [duplicate]

I have an html input.
The input has padding: 5px 10px; I want it to be 100% of the parent div's width(which is fluid).
However using width: 100%; causes the input to be 100% + 20px how can I get around this?
Example
box-sizing: border-box is a quick, easy way to fix it:
This will work in all modern browsers, and IE8+.
Here's a demo: http://jsfiddle.net/thirtydot/QkmSk/301/
.content {
width: 100%;
box-sizing: border-box;
}
The browser prefixed versions (-webkit-box-sizing, etc.) are not needed in modern browsers.
This is why we have box-sizing in CSS.
I’ve edited your example, and now it works in Safari, Chrome, Firefox, and Opera. Check it out: http://jsfiddle.net/mathias/Bupr3/
All I added was this:
input {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
Unfortunately older browsers such as IE7 do not support this. If you’re looking for a solution that works in old IEs, check out the other answers.
Use padding in percentages too and remove from the width:
padding: 5%;
width: 90%;
You can do it without using box-sizing and not clear solutions like width~=99%.
Demo on jsFiddle:
Keep input's padding and border
Add to input negative horizontal margin = border-width + horizontal padding
Add to input's wrapper horizontal padding equal to margin from previous step
HTML markup:
<div class="input_wrap">
<input type="text" />
</div>
CSS:
div {
padding: 6px 10px; /* equal to negative input's margin for mimic normal `div` box-sizing */
}
input {
width: 100%; /* force to expand to container's width */
padding: 5px 10px;
border: none;
margin: 0 -10px; /* negative margin = border-width + horizontal padding */
}
Use css calc()
Super simple and awesome.
input {
width: -moz-calc(100% - 15px);
width: -webkit-calc(100% - 15px);
width: calc(100% - 15px);
}​
As seen here: Div width 100% minus fixed amount of pixels
By webvitaly (https://stackoverflow.com/users/713523/webvitaly)
Original source: http://web-profile.com.ua/css/dev/css-width-100prc-minus-100px/
Just copied this over here, because I almost missed it in the other thread.
Assuming i'm in a container with 15px padding, this is what i always use for the inner part:
width:auto;
right:15px;
left:15px;
That will stretch the inner part to whatever width it should be less the 15px either side.
Here is the recommendation from codeontrack.com, which has good solution examples:
Instead of setting the width of the div to 100%, set it to auto, and be sure, that the <div> is set to display: block (default for <div>).
You can try some positioning tricks. You can put the input in a div with position: relative and a fixed height, then on the input have position: absolute; left: 0; right: 0;, and any padding you like.
Live example
Move the input box' padding to a wrapper element.
<style>
div.outer{ background: red; padding: 10px; }
div.inner { border: 1px solid #888; padding: 5px 10px; background: white; }
input { width: 100%; border: none }
</style>
<div class="outer">
<div class="inner">
<input/>
</div>
</div>
See example here: http://jsfiddle.net/L7wYD/1/
Maybe browsers have changed since this question was last answered, but this is the only thing that has ever worked reliably for me to accomplish this:
width: auto;
left: 0;
right: 0;
Then you can make the margins / padding anything you want and the element will not expand past its available width.
This is similar to #andology's answer from way back but if you make left/right both 0 then you can make margin and/or padding whatever you want. So this is always my default div.
Just understand the difference between width:auto; and width:100%;
Width:auto; will (AUTO)MATICALLY calculate the width in order to fit the exact given with of the wrapping div including the padding.
Width 100% expands the width and adds the padding.
What about wrapping it in a container. Container shoud have style like:
{
width:100%;
border: 10px solid transparent;
}
Try this:
width: 100%;
box-sizing: border-box;
For me, using margin:15px;padding:10px 0 15px 23px;width:100%, the result was this:
The solution for me was to use width:auto instead of width:100%. My new code was:
margin:15px;padding:10px 0 15px 23px;width:auto. Then the element aligned properly:
You can do this:
width: auto;
padding: 20px;

How to make an element width: 100% minus padding?

I have an html input.
The input has padding: 5px 10px; I want it to be 100% of the parent div's width(which is fluid).
However using width: 100%; causes the input to be 100% + 20px how can I get around this?
Example
box-sizing: border-box is a quick, easy way to fix it:
This will work in all modern browsers, and IE8+.
Here's a demo: http://jsfiddle.net/thirtydot/QkmSk/301/
.content {
width: 100%;
box-sizing: border-box;
}
The browser prefixed versions (-webkit-box-sizing, etc.) are not needed in modern browsers.
This is why we have box-sizing in CSS.
I’ve edited your example, and now it works in Safari, Chrome, Firefox, and Opera. Check it out: http://jsfiddle.net/mathias/Bupr3/
All I added was this:
input {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
Unfortunately older browsers such as IE7 do not support this. If you’re looking for a solution that works in old IEs, check out the other answers.
Use padding in percentages too and remove from the width:
padding: 5%;
width: 90%;
You can do it without using box-sizing and not clear solutions like width~=99%.
Demo on jsFiddle:
Keep input's padding and border
Add to input negative horizontal margin = border-width + horizontal padding
Add to input's wrapper horizontal padding equal to margin from previous step
HTML markup:
<div class="input_wrap">
<input type="text" />
</div>
CSS:
div {
padding: 6px 10px; /* equal to negative input's margin for mimic normal `div` box-sizing */
}
input {
width: 100%; /* force to expand to container's width */
padding: 5px 10px;
border: none;
margin: 0 -10px; /* negative margin = border-width + horizontal padding */
}
Use css calc()
Super simple and awesome.
input {
width: -moz-calc(100% - 15px);
width: -webkit-calc(100% - 15px);
width: calc(100% - 15px);
}​
As seen here: Div width 100% minus fixed amount of pixels
By webvitaly (https://stackoverflow.com/users/713523/webvitaly)
Original source: http://web-profile.com.ua/css/dev/css-width-100prc-minus-100px/
Just copied this over here, because I almost missed it in the other thread.
Assuming i'm in a container with 15px padding, this is what i always use for the inner part:
width:auto;
right:15px;
left:15px;
That will stretch the inner part to whatever width it should be less the 15px either side.
Here is the recommendation from codeontrack.com, which has good solution examples:
Instead of setting the width of the div to 100%, set it to auto, and be sure, that the <div> is set to display: block (default for <div>).
You can try some positioning tricks. You can put the input in a div with position: relative and a fixed height, then on the input have position: absolute; left: 0; right: 0;, and any padding you like.
Live example
Move the input box' padding to a wrapper element.
<style>
div.outer{ background: red; padding: 10px; }
div.inner { border: 1px solid #888; padding: 5px 10px; background: white; }
input { width: 100%; border: none }
</style>
<div class="outer">
<div class="inner">
<input/>
</div>
</div>
See example here: http://jsfiddle.net/L7wYD/1/
Maybe browsers have changed since this question was last answered, but this is the only thing that has ever worked reliably for me to accomplish this:
width: auto;
left: 0;
right: 0;
Then you can make the margins / padding anything you want and the element will not expand past its available width.
This is similar to #andology's answer from way back but if you make left/right both 0 then you can make margin and/or padding whatever you want. So this is always my default div.
Just understand the difference between width:auto; and width:100%;
Width:auto; will (AUTO)MATICALLY calculate the width in order to fit the exact given with of the wrapping div including the padding.
Width 100% expands the width and adds the padding.
What about wrapping it in a container. Container shoud have style like:
{
width:100%;
border: 10px solid transparent;
}
Try this:
width: 100%;
box-sizing: border-box;
For me, using margin:15px;padding:10px 0 15px 23px;width:100%, the result was this:
The solution for me was to use width:auto instead of width:100%. My new code was:
margin:15px;padding:10px 0 15px 23px;width:auto. Then the element aligned properly:
You can do this:
width: auto;
padding: 20px;

How can I make a TextArea 100% width without overflowing when padding is present in CSS?

I have the following CSS and HTML snippet being rendered.
textarea
{
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
}
<div style="display: block;" id="rulesformitem" class="formitem">
<label for="rules" id="ruleslabel">Rules:</label>
<textarea cols="2" rows="10" id="rules"></textarea>
</div>
Is the problem is that the text area ends up being 8px wider (2px for border + 6px for padding) than the parent. Is there a way to continue to use border and padding but constrain the total size of the textarea to the width of the parent?
Why not forget the hacks and just do it with CSS?
One I use frequently:
.boxsizingBorder {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
See browser support here.
The answer to many CSS formatting problems seems to be "add another <div>!"
So, in that spirit, have you tried adding a wrapper div to which the border/padding are applied and then putting the 100% width textarea inside of that? Something like (untested):
textarea
{
width:100%;
}
.textwrapper
{
border:1px solid #999999;
margin:5px 0;
padding:3px;
}
<div style="display: block;" id="rulesformitem" class="formitem">
<label for="rules" id="ruleslabel">Rules:</label>
<div class="textwrapper"><textarea cols="2" rows="10" id="rules"/></div>
</div>
let's consider the final output rendered to the user of what we want to achieve: a padded textarea with both a border and a padding, which characteristics are that being clicked they pass the focus to our textarea, and the advantage of an automatic 100% width typical of block elements.
The best approach in my opinion is to use low level solutions as far as possible, to reach the maximum browsers support.
In this case the only HTML could work fine, avoiding the use of Javascript (which anyhow we all love).
The LABEL tag comes in our help because has such behaviour and is allowed to contain the input elements it must address to.
Its default style is the one of inline elements, so, giving to the label a block display style we can avail ourselves of the automatic 100% width including padding and borders, while the inner textarea has no border, no padding and a 100% width.
Taking a look at the W3C specifics other advantages we may notice are:
no "for" attribute is needed: when a LABEL tag contains the target input, it automatically focuses the child input when clicked;
if an external label for the textarea has already been designed, no conflicts occur, since a given input may have one or more labels.
See W3C specifics for more detailed information.
Simple example:
.container {
width: 400px;
border: 3px
solid #f7c;
}
.textareaContainer {
display: block;
border: 3px solid #38c;
padding: 10px;
}
textarea {
width: 100%;
margin: 0;
padding: 0;
border-width: 0;
}
<body>
<div class="container">
I am the container
<label class="textareaContainer">
<textarea name="text">I am the padded textarea with a styled border...</textarea>
</label>
</div>
</body>
The padding and border of the .textareaContainer elements are the ones we want to give to the textarea. Try editing them to style it as you want.
I gave large and visible padding and borders to the .textareaContainer element to let you see their behaviour when clicked.
If you're not too bothered about the width of the padding, this solution will actually keep the padding in percentages too..
textarea
{
border:1px solid #999999;
width:98%;
margin:5px 0;
padding:1%;
}
Not perfect, but you'll get some padding and the width adds up to 100% so its all good
I came across another solution here that is so simple: add padding-right to the textarea's container. This keeps the margin, border, and padding on the textarea, which avoids the problem that Beck pointed out about the focus highlight that chrome and safari put around the textarea.
The container's padding-right should be the sum of the effective margin, border, and padding on both sides of the textarea, plus any padding you may otherwise want for the container. So, for the case in the original question:
textarea{
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
}
.textareacontainer{
padding-right: 8px; /* 1 + 3 + 3 + 1 */
}
<div class="textareacontainer">
<textarea></textarea>
</div>
This table hack code works for me in all browsers from IE8+
<td>
<textarea style="width:100%" rows=3 name="abc">Modify width:% accordingly</textarea>
</td>
I was looking for an inline-styling solution instead of CSS solution, and this is the best I can go for a responsive textarea:
<div style="width: 100%; max-width: 500px;">
<textarea style="width: 100%;"></textarea>
</div>
The problem lies in the box-sizing property.
By default, the initial value of the box-sizing property is content-box.
so you have something like this under the hood:
textarea {
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
box-sizing: content-box;
}
box-sizing: content-box; means that the width of the actual element is equal to the width of the element's content box.
so when you add padding (in this case padding-right and padding-left --> because we are talking about width) and border (in this case border-right and border-left --> because we are talking about width), these values get added to the final width. so your element will be wider than you want.
set it to box-sizing: border-box;. so the width will be calculated like so:
horizontal border + horizontal padding + width of content box = width
in this case, when you add horizontal border and horizontal padding, the final width of element does not change, in fact, the content box will shrink to satisfy the equation.
You can make use of the box-sizing property, it's supported by all the main standard-compliant browsers and IE8+. You still will need a workaround for IE7 though. Read more here.
No, you cannot do that with CSS. That is the reason Microsoft initially introduced another, and maybe more practical box model. The box model that eventually won, makes it inpractical to mix percentages and units.
I don't think it is OK with you to express padding and border widths in percentage of the parent too.
If you pad and offset it like this:
textarea
{
border:1px solid #999999;
width:100%;
padding: 7px 0 7px 7px;
position:relative; left:-8px; /* 1px border, too */
}
the right side of the textarea perfectly aligns with the right side of the container, and the text inside the textarea aligns perfectly with the body text in the container... and the left side of the textarea 'sticks out' a bit. it's sometimes prettier.
For people who use Bootstrap, textarea.form-control can lead to textarea sizing issues as well. Chrome and Firefox appear to use different heights with the following Bootstrap CSS:
textarea.form-conrtol{
height:auto;
}
I often fix that problem with calc(). You just give the textarea a width of 100% and a certain amount of padding, but you have to subtract the total left and right padding of the 100% width you have given to the textarea:
textarea {
border: 0px;
width: calc(100% -10px);
padding: 5px;
}
Or if you want to give the textarea a border:
textarea {
border: 1px;
width: calc(100% -12px); /* plus the total left and right border */
padding: 5px;
}
How about negative margins?
textarea {
border:1px solid #999999;
width:100%;
margin:5px -4px; /* 4px = border+padding on one side */
padding:3px;
}
The value of the padding has a role to play. Using the style you posted:
textarea {
border:1px solid #999999;
width:100%;
margin:5px 0;
padding:3px;
}
The width is already filled up and you have padding left, right to be 3px. So there will be an overflow.
If you change your style to this:
textarea
{
border:1px solid #999999;
width:98%;
margin:5px 0;
padding: 3px 1%;
}
What my styling is doing now is it has a width of 98% and its remaining 2% to complete a 100% and that is why I gave padding left 1% and padding right 1%. With this, the issue of overflow should be fixed