Sometimes CSS Absolute positioning is not adhered to properly

CSS:

.layers {
    position: relative;
    height: 500px;
    width: 500px;
    /* Some -webkit and -moz transformations */
}
.layers > div {
    position: absolute;
    height: 500px;
    width: 500px;
 }
.item {
    position: absolute;
    width: 5px;
    height: 5px; 
}

HTML:

<article class="someclass">
    <section class="layers">
       <div style="/* -webkit and -moz transformations */">
           <img src='image.png'>
           <div class="item" style="/* -webkit and -moz transformations */">test</div>
       </div>
    </section>
</article>

Upon loading this page, the image image.png is displayed with the text test on top of it around 90% of the time.

(the specific position may vary due to the transformations applied) The remaining 10% of the time that I attempt to load the page, the item div appears as if its position is static, causing it not to be positioned on top of the image.

My assumption is that this issue might be related to the timing of element loading, so there may not be a definitive solution. However, I could be overlooking something in my implementation.

For reference, I tested this on Chrome and Safari, achieving consistent results in both browsers.

Answer №1

The reason for the inconsistent behavior lies in two factors: Firstly, you have not defined the specific position (e.g. top/left) for the .item elements, and secondly, the dimensions of your image are not specified, causing the browser to be unaware of its size until it is loaded.

Due to the lack of a specified position, coupled with absolute positioning, the .item elements default to their static positions, resulting in them being positioned directly below the image. For more information on this, refer to this resource.

If you notice the .item elements appearing below the image, it indicates that the image is already cached in your browser, enabling it to determine the size during the initial layout run and placing the items accordingly.

On the other hand, if you see the .item elements placed on top of the image, it suggests that the browser has not yet calculated the image's size as it is still loading. In such cases, the items are positioned as though the image has zero height. Despite the usual recalculation of the layout after the image loads, the .item elements may remain in place due to their absolute positioning, which removes them from the normal flow of the layout.

To resolve this issue, establish a definite position for your absolutely-positioned elements, ensuring smoother functionality moving forward.

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