Internet Explorer will automatically apply a blue border to a div element when a CSS gradient is utilized

I'm attempting to create a gradual fading gray line by using a div that is sized at 1x100px with a CSS gradient applied for the fade effect.

The only issue I am encountering is in Internet Explorer where the div is displaying a blue border which I am unable to remove.

Below is the CSS code for the div:

#left_header_border {
    position:absolute;
    bottom:-1px;
    left:-100px;
    width:100px;
    height:1px;  

    /* gradient */
    background-color: transparent;
    background-image: -moz-linear-gradient(left, transparent, #cccccc); /* FF3.6 */
    background-image: -o-linear-gradient(left, transparent, #cccccc); /* Opera 11.10+ */
    background-image: -webkit-gradient(linear,left bottom,right bottom,color-stop(0, transparent),color-stop(1, #cccccc)); /* Saf4+, Chrome */
    background-image: -webkit-linear-gradient(left,transparent, #cccccc); /* Chrome 10+, Saf5.1+ */
    background-image: linear-gradient(left, transparent, #cccccc);
              filter: progid:DXImageTransform.Microsoft.gradient(gradientType=1, startColorStr='transparent', EndColorStr='#cccccc'); /* IE6–IE9 */
}

I have attempted to adjust the height of the div in order to resolve the issue with the gradient appearing blue and the border being added, but no success so far. Any suggestions on why this might be happening?

Answer №1

Adjust the filter to achieve the desired effect:

filter: progid:DXImageTransform.Microsoft.gradient(gradientType=1, startColorStr='#00cccccc', EndColorStr='#ffcccccc'); /* Compatible with IE6–IE9 */

The filter does not support using “transparent” as a color value, however, it does allow you to utilize an 8-digit hex reference. This reference includes two digits for specifying opacity, similar to the last value in rgba() color references.

For further information on utilizing RGBA and transparency with MS Filters, visit this resource.

If the mathematical aspect seems daunting, you can determine values like 0.6 transparency by using Windows calculator in scientific mode - simply perform the calculation 255*0.6 = 153, then select the "hex" option for conversion resulting in 99.

In the provided example, the gradient ranges from fully transparent (0.0 opacity) at hex value "00" to fully opaque (1.0 opacity) at hex value "ff".

Update: For a convenient tool converting RGBa to MS Filter syntax, check out this helpful converter linked by thirtydot in the comments section.

Answer №2

For a better approach, I suggest utilizing CSS3Pie rather than manually inputting the filter style in this scenario. CSS3Pie simplifies the process and ensures greater compliance with standards; it enables you to apply standard CSS3 for gradients in outdated versions of Internet Explorer.

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