矩形和文本元素对不同的事件 -- 如移动鼠标和单击 -- 做出反应，产生一种简单的滚动效果。
The rectangle and text elements react to the different events, such as moving the mouse and clicking, to create a simple rollover effect.
它们会随鼠标移动，当键盘事件发生时不消失。
They follow the cursor's movement, and do not disappear when keyboard events occur.
超负荷的系统加载和各种其他因素会影响Firefox接收鼠标移动和键盘事件。
Heavy system load and a variety of other factors can affect when Firefox receives the mouse move and keyboard events.
应用推荐