Struggling with understanding the box model concept

My challenge involves styling a container named #profile-grid to be exactly 330px wide. Within this container, there is an image and an inline list that are both supposed to be the same width as the container with a 1px border all around. Surprisingly, everything lines up perfectly in IE, but Chrome seems to be cutting it short by 2px. Can someone help me figure out what might be causing this discrepancy? Check out my code snippet at http://jsfiddle.net/ZPQUP/13/

Answer №1

The main issue at hand, as indicated by your heading, revolves around the box model.

To address this issue effectively, it is recommended to explicitly set the box model and then utilize a polyfill to ensure compatibility with older browsers. For further insights into this problem and its solution, refer to Paul Irish's explanation available at:

You can see how this concept is implemented in an updated fiddle by visiting: http://jsfiddle.net/mstauffer/ZPQUP/14/

In essence, the various box models vary in terms of whether borders and paddings are included within or added externally to the width.

Answer №2

The #listed division measures 330 pixels across, with an additional pixel on either side for the border according to the 'standard' box model. To ensure proper alignment, adjust the width by subtracting 1 pixel from each side (resulting in 298px)...

...this adjustment should yield consistent results in modern browsers, although older versions of IE may present a challenge. Utilizing a valid DOCTYPE declaration can help remedy this issue.

Answer №3

VIEW DEMO:

Sample HTML:

<div id="profile-grid">
    <img src="http://example.com/profile-pic.jpg"/>
    <ul id="listed">
            <li class="item"><a href="#"> Profile </a></li>
            <li class="item"><a href="#"> About </a></li>
            <li class="item"><a href="#"> Photos </a></li>
            <li class="item"><a href="#"> Albumlist </a></li>
        </ul>    
</div>​

CSS Styling:

#profile-grid {
    height: 302px;
    width: 330px;
}

#profile-grid img {
    display: block;
    width: 100%;
    padding: 0px 0px 0px 0px;
    margin: 0px 0px 0px 0px;
}

#listed {
    height: 50px;
    border: 1px solid #ddd;
    overflow: hidden;
}

li.item {
    margin: 0px;
    display: inline;
    float: left;
    height: 50px;
    border-left: 1px solid #ddd;
    display: inline;
}

#listed li a {
    display: block;
    font-family: "lucida grande",tahoma,verdana,arial,sans-serif;
    font-size: 15px;
    color: #123454;
    line-height: 50px;
    padding: 0px 15px 0;
    text-align: center;
    text-decoration: none;
    vertical-align: baseline;
}

#listed li a:hover{
    font-family: "lucida grande",tahoma,verdana,arial,sans-serif;
    font-size: 15px;
    color: white;
    background-color: #123454;
    text-align: center;
    text-decoration: none;
}

Important Details:

  • <ul> automatically expands to the width of its parent element. If the parent is 330px wide, the <ul> will also be 330px wide.

  • If no width is specified for a block element, its 100% width includes borders. Therefore, if the parent is 330px wide, the block element (in this case <ul>) will be 298px wide plus 1px left border and 1px right border.

  • Specifying width for an element excludes borders from the count, causing overflow in some cases.

  • Using display:block and width:100% for images maintains their ratio without distortion.

Answer №4

To prevent encountering this issue, it is recommended to avoid combining width with padding or border properties on the same element.

In your particular scenario, if you eliminate the width: 330px declaration from the .listed class and instead apply it to the .listed ul class, the problem should be resolved:

#listed {
    display: block;
    padding: 0px;
    margin: 0px;
    height: 50px;
    overflow: hidden;
    border: 1px solid #ddd;
}

#listed ul {
    margin: 0;
    padding: 0;
    overflow: hidden;
    width: 330px;
}

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