css3 – bootstrap 3内置图像替换？

// CSS image replacement
//
// Heads up! v3 launched with with only `.hide-text()`, but per our pattern for
// mixins being reused as classes with the same name, this doesn't hold up. As
// of v3.0.1 we have added `.text-hide()` and deprecated `.hide-text()`. Note
// that we cannot chain the mixins together in Less, so they are repeated.
//
// Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757

// Deprecated as of v3.0.1 (will be removed in v4)
.hide-text() {
  font: ~"0/0" a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}
// New mixin to use as of v3.0.1
.text-hide() {
  font: ~"0/0" a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}

有没有人用过这个？我在哪里指定要替换文本的图像？我是否正确地假设所有这一切都是隐藏文本而不是用图像替换它？

.my-image-replacement {
  background-image:url('myImage.jpg');
  .text-hide();
}