Resetting the opacity of a child element - Maple Browser (Samsung TV App)

Question

I have an issue with creating a transparent element which has a child element. Using this code the child element gets the opacity value from the parent element.

I ne

Answer 1

The problem you probably have (based on looking at your selectors) is that opacity affects all child elements of a parent:

div
{
    background: #000;
    opacity: .4;
    padding: 20px;
}

p
{
    background: #f00;
    opacity: 1;
}​

http://jsfiddle.net/Kyle_/TK8Lq/

But there is a solution! Use rgba background values and you can have transparency wherever you want :)

div
{
    background: rgba(0, 0, 0, 0.4);
    /*opacity: .4;*/
    padding: 20px;
}

p
{
    background: rgba(255, 0, 0, 1);
    /*opacity: 1;*/
}​

http://jsfiddle.net/Kyle_/TK8Lq/1/

---

For text, you can just use the same rgba code, but set to the color property of CSS:

color: rgba(255, 255, 255, 1);

But you must use rgba on everything for this to work, you have to remove the opacity for all parent elements.

http://jsfiddle.net/Kyle_/TK8Lq/2/

Answer 2

Kyle's solution works fine.

In addition, if you don't like to set your colors using RGBA, but rather using HEX, there are solutions.

With LESS for exemple, you could use a mixin like:

.transparentBackgroundColorMixin(@alpha,@color) {
  background-color: rgba(red(@color), green(@color), blue(@color), @alpha);
}

And use it like

.myClass {
    .transparentBackgroundColorMixin(0.6,#FFFFFF);
}

Actually this is what a built-in LESS function also provide:

.myClass {
    background-color: fade(#FFFFFF, 50%);
}

See How to convert HEX color to rgba with Less compiler?

Answer 3

Answer above works well, however for people who like using hex color codes, you can set transparency by hex color itself. EXP: #472d20b9 - the last two values set opacity for color while #472d20 will be the same color but without opacity. Note: Works fine in Chrome and Firefox, while Edge and IE doesn't. Haven't had a chance to test it in other browsers.