CSS: No.
JavaScript: Delegate a click event, which adds a target="_blank" attribute on click of a link.
document.body.addEventListener(function(e) {
if (e.target.nodeName.toUpperCase() === 'A' && e.target.href) {
e.target.target = '_blank';
}
}, true);
Note: If the element contains other elements, you might want to traverse the tree to find out whether an anchor element is clicked:
document.body.addEventListener(function(e) {
var target = e.target;
do {
if (target.nodeName.toUpperCase() === 'A' && target.href) {
target.target = '_blank';
break;
}
} while (target = target.parentElement);
}, true);
Or, if you're a jQuery-lover:
$('body').on('click', 'a', function(e) {
e.target.target = '_blank';
});