What are some ways to implement CSS2 specifications in case CSS3 support is not detected by the browser?

I am currently working on a website using HTML5 and CSS3, but I also need it to be compatible with older browsers. Although I am using the Modernizr library, it does not allow me to replace certain CSS3 elements with CSS2 alternatives.

For example, I have a div that utilizes border-radius and box-shadow. In case CSS3 is not supported, I aim to serve an alternative style featuring a background image incorporating rounded corners and faded borders.

Perhaps I could try adding an extension to the class name:

CSS3 Class - .mainContent
CSS2 Class - .mainContentFlat
htmlcss

Answer №1

I am working on a div that utilizes both border-radius and box-shadow properties.

Is it possible for modernizr.js to handle this effectively?

Imagine you have a specific div that you want to style with an id of "test"

<div id="test">
    Hello HTML5 CSS3
</div>

You can apply CSS in the following way:

div#test{
    height: 50px;
    width: 200px;
    border: 1px solid #CCC;
}

.borderradius div#test {
   border-radius: 4px 4px 0 0;
   -moz-border-radius-topleft: 4px;
   -moz-border-radius-topright: 4px;
   -webkit-border-top-left-radius: 4px;
   -webkit-border-top-right-radius: 4px;
}
.no-borderradius div#test {
    /*add style rules for css2 here*/
}
.boxshadow div#test {
   box-shadow: #666 1px 1px 1px;
   -moz-box-shadow: #666 1px 1px 1px;
   -webkit-box-shadow: #666 1px 1px 1px;
}
.no-boxshadow div#test {
 /*add style rules for css2 here*/   
}

Answer №2

Consider the css2 rules as your foundation and the css3 rules as your enhancement. When there is a conflict, you can override the effect using css inheritance. For example, in the scenario you mentioned:

.mainContent {
  background: #fff url(image-with-shadow-and-rounded-corners.png) top left no repeat;
}

.boxshadow.borderradius .mainContent {
  background-image: none; /*remove background image if css3 support*/
  -moz-border-radius: 5px;
  -wekbkit-border-radius: 5px;
  border-radius: 5px;
  -moz-box-shadow: 0 0 5px #000;
  -wekbkit-box-shadow: 0 0 5px #000;
  box-shadow: 0 0 5px #000;
}

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