To verify support for CSS properties such as border-radius, use the following code snippet:
if(document.createElement('test').style.borderRadius===''){
//some code
}
But how can I check for support of linear gradients? The declaration is like this:
background:linear-gradient(top,bottom,#123,#456);
P.S. I prefer not to rely on Modernizr. I am interested in learning how to do this myself.
After doing some research, I found the source code for Modernizr that is used to search for background images and gradients. Here is an excerpt:
var str1 = 'background-image:';
var str2 = 'gradient(linear,left top,right bottom,from(#9f9),to(white));';
var str3 = 'linear-gradient(left top,#9f9, white);';
var css =
(str1 +' -webkit- '.split(' ').join(str2 + str1) +
prefixes.join(str3 + str1)).slice(0, -str1.length);
var elem = createElement('div');
var style = elem.style;
style.cssText = css;
return ('' + style.backgroundImage).indexOf('gradient') > -1;
If you are planning to use this functionality, it is recommended to utilize the Modernizr library rather than directly copying or modifying the code. It's important to respect licenses and copyright information when borrowing code from third parties.
If you're looking to create your own version of Modernizr on a budget, it's definitely possible. However, my recommendation is to organize all the checks within a browser validation object for simplicity. Here's how I approach it:
// Determine browser capabilities
var browser = {
'3d': testCss('perspective', 'Perspective'),
'addEventListener': !!window.addEventListener,
'animations': testCss('animationName', 'AnimationName'),
'canvas': !!window.CanvasRenderingContext2D,
'gradients': testCss('backgroundImage', '', 'background-image:linear-gradient(black,white),radial-gradient(black,white)'),
'svg': !!(document.createElementNS && document.createElementNS('http://www.w3.org/2000/svg','svg').createSVGRect),
'touch': !!('ontouchstart' in window || (window.DocumentTouch && document instanceof DocumentTouch) || navigator.msMaxTouchPoints),
'transitions': testCss('transitionProperty', 'Transition'),
'vw': testCss('width', '', 'width:100vw')
};
function testCss(sPropStandard, sPropPrefixed, sCss) {
var isSupported = false;
if (sCss===undefined) {
// Check property support
var aProps = [
sPropStandard,
'Webkit' + sPropPrefixed,
'Moz' + sPropPrefixed,
'ms' + sPropPrefixed,
'O' + sPropPrefixed
];
for (var i=0; i<aProps.length; ++i) {
if (aProps[i] in document.documentElement.style) {
isSupported = true;
break;
}
}
} else {
// Check value support
var el = document.createElement('temp');
el.style.cssText = sCss;
isSupported = el.style[sPropStandard]!=='';
delete el;
}
return isSupported;
}
With this setup, you can easily determine if the browser supports CSS3 gradients like so:
if (browser.gradients) {
// Implementation for browsers that support gradients
}
Similarly, for checking SVG support in the browser:
if (browser.svg) {
// Implement specific actions for SVG-supported browsers
}
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