Question

Prevent inheritance of styles from parent element

Asked by: rowan_bradley

I've got a web site that currently works fine, but needs a bit of a face-lift. It incudes all sorts of content, tables, images etc., some of which is created by javascripts that I got from elsewhere and am not 100% competent to change. I now want to have this page appear in a large white box centred on a light grey background. I've more or less achieved this by making the page background light grey, and creating a single cell table with a white background, padding-left and padding-right 50px etc. but my problem is that I want the original content to appear in the box but otherwise exactly like it was before. I can't stop it inheriting all sorts of properties (in particular the padding) from the parent table. I've read lots of articles that say you can't stop CSS from inheriting, that's what it was designed to do, you just have to create another style to override the inherited values, but I don't even know what properties to give this new style. It can't really be this difficult to do something so simple, can it? How do I get this to do what I want?

Thanks - Rowan

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Asked On
2009-07-31 at 11:10:29ID24617518
Tags

css style inheritance parent reset default

Topic

Cascading Style Sheets (CSS)

Participating Experts
3
Points
500
Comments
7

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Answers

 

by: toymachiner62Posted on 2009-07-31 at 11:31:19ID: 24991237

You can't stop css from inheriting styles from the parent elements, but you can give the child elements different styles than the parents.

Example:

<div id="container">
    <div id="inside">
        <ul>
            <li>stuff</li>
            <li>stuff</li>
        </ul>
    </div>
</div>

Now if you have the style
div {
    background-color:purple;
} it will set all the divs background colors to purple.

If you have
div {
    background-color:purple;
}
#inside {
    background-color:white;
}

this will make the background color of all divs purple, but the div with the id=inside will be white.

If you give an html tag an id, you can set the style by using the '#' symbol.

You could also set just the background color of one specific <li> by giving one of them an id="something" and then set the style to
#something {
    background-color:purple;
}

Does this make sense?

 

by: renazonsePosted on 2009-07-31 at 11:33:00ID: 24991253

The inheritance is avoided by not changing the default styles of the HTML tags. IE if you change the padding for the table tag like so:

table { padding:0; }

all of the tables are going to have a padding of 0 out of the blocks. But, if you use a separate style:

.tablePadding { padding:0; }

It only applies to the object the style is attached to. Anything within the container with the .tablePadding is going to inherit the inheritable values but those values can be adjusted by applying separate styles to the container within the container.

Better explanations and examples can be given if you can provide a snippet that illustrates your exact issue.

 

by: toymachiner62Posted on 2009-07-31 at 11:35:21ID: 24991262

To get the light grey background with a centered white box, you can just use two <div> tags like this

<div id="container">
    <div id="content">
        <!--your stuff here-->
    </div>
</div>

#container {
    background-color: grey;
}
#content {
    background-color:white;
    margin-left: auto; /* this will make the content <div> centered */
    margin-right: auto; /* this will make the content <div> centered */
}

 

by: renazonsePosted on 2009-07-31 at 11:37:49ID: 24991282

You'll want to add a static width to that #content to get it to center up, otherwise it's just 100% by default:

#content {
    width:760px;
    background-color:white;
    margin-left: auto; /* this will make the content <div> centered */
    margin-right: auto; /* this will make the content <div> centered */
}

 

by: toymachiner62Posted on 2009-07-31 at 11:40:56ID: 24991312

Oh yea my bad, good catch

 

by: afoong1Posted on 2009-07-31 at 16:45:07ID: 24993325

my suggestion is to use Firebug if you are on Firefox, or Chrome's inspect element feature if you are on Chrome (IE had a developer tool bar if you insist on using IE)

you can check the styles that are currently being inherited (all of the inherited styles, not just for one class)

forexample, if you examine a div element, every style put on this div will be listed.

using this, create a new style and add whatever css styles you want from teh inherited list.
if needed, you can edit the styles to fit your purposes

 

by: rowan_bradleyPosted on 2009-08-18 at 09:17:46ID: 31610297

The problem was that since everything on my web page needed to be inside a table cell, there was no way to avoid them inheriting the styles from the table cell, and this changed the appearance of the content. The solutions that used classes or IDs to determine which elements styles applied to therefore missed the point. What I needed to know was how to tell what styles were being used, and where they came from. I then created an element inside my table cell and set the relevant styles back to what my content needed. Using Firebug (which I didn't know about before) gave me the information to do this. The IE Developer Toolbar also seems a good tool for doing a similar thing, and helped me pin down some differences in behaviour between Firefox and IE. So many thanks for all your replies, and especially for directing me towards Firebug and IE Developer Toolbar, both of which I will no doubt keep using.

Rowan

20120131-EE-VQP-002

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