What is the role of the CSS URL property in web design?

Occasionally, I enjoy the challenge of "reverse engineering" websites, especially those with a complex design. By dissecting these sites, I aim to gain insight into the techniques employed by other developers.

Recently, my curiosity led me to analyze the League of Legends website. My initial approach was to investigate how they positioned their site's header/navigation image. Using Firefox, I utilized the "right-click -> inspect" function, which revealed the following snippet:

<html>..........
<body class="not-front not-logged-in page-node node-type-lc-article no-sidebars i18n-en pvpnetbar">
    <style> … </style>
        <div id="lol-header" class="i18n-en" role="banner">
            <div class="section clearfix">
                <div id="lol-header-sitename">
                    <a id="site-name" class="hidden-text" alt="Home" rel="home" title="Home" href="http://na.leagueoflegends.com/"> … </a>
                </div>
......</html>

The 'lol-header' div contains a CSS Url property with the value:

url("../img/lol-header-sprite.png")

Typically, when encountering two dots before a forward slash in a URL, it indicates navigating to the parent directory. However, in this case, even though the relative URL should be "http://na.leagueoflegends.com/img/lol-header-sprite.png" based on the parent directory, it doesn't seem to work. This inconsistency persists even when accessing the main page.

This discrepancy has left me feeling puzzled, as I thought I had a solid understanding of web coding. It's a bit disorienting :-\

Answer №1

In the page you mentioned, the CSS files are loaded in the following way:

@import url('/sites/default/files/lol_global_elements/css/lol_global_elements.css');

This is the CSS rule being used:

background: transparent url(../img/lol-header-sprite.png) 50% 0px no-repeat;

When you see ../, it signifies going up one level from where the file was initially loaded. So, starting with the first URL, it would start as:

http://na.leagueoflegends.com/sites/default/files/lol_global_elements/

Then it appends img/lol-header-sprite.png to provide the complete path:

http://na.leagueoflegends.com/sites/default/files/lol_global_elements/img/lol-header-sprite.png

Answer №2

The image location is determined by the relationship with the CSS file containing the styling for this particular division.

In this case, the CSS file can be found at:

http://eune.leagueoflegends.com/sites/default/files/lol_global_elements/css/lol_global_elements.css

Therefore, the image can be located here:

 http://eune.leagueoflegends.com/sites/default/files/lol_global_elements/img/lol-header-sprite.png

The ../img within the /css folder leads to lol_global_elements/img

Answer №3

Utilize an Absolute URL that is relative to the website:

url("/img/wow-banner-sprite.png")

Consistently, it points to

http://us.worldofwarcraft.com/img/wow-banner-sprite.png
.

Answer №4

Give it a shot

url("/img/haha-header-sprite.png")

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