HTML element resizing unexpectedly due to browser interactions

I recently created a sleek HTML transparent header bar using the following CSS:

#head-bar{
    position:fixed;
    top: 0px;
    width:100%;
    left:0px;
    min-height:25%;
    z-index:2;
    background-color:#000;
    background: rgba(0, 0, 0, 0.5);
}

Encountering the Problem:

However, I noticed that when certain browser toolbars are enabled, the height of this div decreases. The same issue occurs when tools like Firebug panel or Firefox's console are enabled. To tackle this problem, I attempted to dynamically set the height of the div using jQuery, but to no avail.

$(window).height() * 25 / 100; // unsuccessful attempt

If you have any insights on how I can maintain a fixed state for this div despite these challenges, I would greatly appreciate your guidance.

javascriptjqueryhtmlcss

Answer №1

The percentage unit allows for flexibility in appearance depending on the browser's state. To maintain a consistent height, it's recommended to specify the height in px/pt or use the 'em' units. When using percentages, the height of the div will adjust accordingly whenever the browser's height changes, following the CSS rule defined (25%).

Answer №2

Here is the link to your current Fiddle.

Below is the jQuery snippet that can help resolve the issue at hand.

$(function () {
    $('#head-bar').height($(window).height() * 25 / 100);
})

Additionally, here is an example fiddle that demonstrates the corrected code.

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