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56 lines
2.1 KiB
56 lines
2.1 KiB
7 years ago
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// CSS Regions
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// http://www.w3.org/TR/css3-regions/
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// By: Mihai Balan
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// We start with a CSS parser test then we check page geometry to see if it's affected by regions
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// Later we might be able to retire the second part, as WebKit builds with the false positives die out
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Modernizr.addTest('regions', function() {
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/* Get the 'flowFrom' property name available in the browser. Either default or vendor prefixed.
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If the property name can't be found we'll get Boolean 'false' and fail quickly */
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var flowFromProperty = Modernizr.prefixed("flowFrom"),
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flowIntoProperty = Modernizr.prefixed("flowInto");
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if (!flowFromProperty || !flowIntoProperty){
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return false;
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}
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/* If CSS parsing is there, try to determine if regions actually work. */
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var container = document.createElement('div'),
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content = document.createElement('div'),
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region = document.createElement('div'),
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/* we create a random, unlikely to be generated flow number to make sure we don't
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clash with anything more vanilla, like 'flow', or 'article', or 'f1' */
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flowName = 'modernizr_flow_for_regions_check';
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/* First create a div with two adjacent divs inside it. The first will be the
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content, the second will be the region. To be able to distinguish between the two,
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we'll give the region a particular padding */
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content.innerText = 'M';
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container.style.cssText = 'top: 150px; left: 150px; padding: 0px;';
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region.style.cssText = 'width: 50px; height: 50px; padding: 42px;';
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region.style[flowFromProperty] = flowName;
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container.appendChild(content);
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container.appendChild(region);
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document.documentElement.appendChild(container);
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/* Now compute the bounding client rect, before and after attempting to flow the
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content div in the region div. If regions are enabled, the after bounding rect
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should reflect the padding of the region div.*/
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var flowedRect, delta,
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plainRect = content.getBoundingClientRect();
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content.style[flowIntoProperty] = flowName;
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flowedRect = content.getBoundingClientRect();
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delta = flowedRect.left - plainRect.left;
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document.documentElement.removeChild(container);
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content = region = container = undefined;
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return (delta == 42);
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});
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