在一个跨浏览器的环境里开发应用程序的时候，你必须小心，以确保用户界面是不依赖于特定浏览器的某个事件的。对多个事件标准进行大量不同的解释会增加额外的难度。向管理层解释由于onbeforeunload事件是微软浏览器（所独有）的一个扩展，因而只有运行Internet
Explorer的用户才能使用这个新的电子商务网站，这是十分尴尬的。同样尴尬的事情是：事件在跨越不同浏览器的时候，其行为会不同。为了避免这样的窘境，你需要稍稍研究一下（解决方法），而最好的起点就是万维网协会（World Wide Web Consortium）所发布的HTML 4.0规范的第18章。这一规范的这一部分描述了脚本编写的要求，并列出了HTML文档里一些内置可用的基础事件。这些事件都显示在表格A里，它们都是最基本的事件。表格B描述了微软的Internet Explorer以及Mozilla所支持的额外事件。在一个受到控制的环境里，例如在浏览器及其版本可以自由指定的内部网（Intranet）里，额外的事件处理器就都可以使用了，因此很多的事情都可以实现。
| 表格A | ||
| 事件名称 | 处理器 | 描述 |
| blur | onblur | Element loses focus |
| change | onchange | Element's value has changed due to user action |
| click | onclick | Element clicked |
| dblclick | ondblclick | Element double clicked |
| focus | onfocus | Element receives focus |
| keydown | onkeydown | Keyboard key pressed |
| keypress | onkeypress | Combination of keydown and keyup, used for keyboard combinations |
| keyup | onkeyup | Keyboard key released |
| load | onload | Window or frame has loaded |
| mousedown | onmousedown | Mouse button is pressed over an element |
| mousemove | onmousemove | Mouse pointer is moved while over an element |
| mouseout | onmouseout | Mouse pointer is moved off an element |
| mouseover | onmouseover | Mouse pointer is over an element |
| mouseup | onmouseup | Mouse button is released over an element |
| reset | onreset | Form is reset |
| select | onselect | Text in text field is selected |
| submit | onsubmit | Form is submitted |
| unload | onunload | Window or frame has unloaded |
HTML所支持的一些内置的基本事件
| 表格B | ||
| 事件名称 | 处理器 | 描述 |
| abort | onabort | User aborted image download |
| blur | onblur | Element loses focus |
| change | onchange | Element's value has changed due to user action |
| click | onclick | Element clicked |
| contextmenu | oncontextmenu | User right clicks on document creating context menu |
| dblclick | ondblclick | Element double clicked |
| dragenter | ondragenter | Object dragged to target element |
| dragover | ondragover | Object dragged over target element |
| error | onerror | Error occurs during object loading |
| focus | onfocus | Element receives focus |
| keydown | onkeydown | Keyboard key pressed |
| keypress | onkeypress | Combination of keydown and keyup, used for keyboard combinations |
| keyup | onkeyup | Keyboard key released |
| load | onload | Window or frame has loaded |
| mousedown | onmousedown | Mouse button is pressed over an element |
| mousemove | onmousemove | Mouse pointer is moved while over an element |
| mouseout | onmouseout | Mouse pointer is moved off an element |
| mouseover | onmouseover | Mouse pointer is over an element |
| mouseup | onmouseup | Mouse button is released over an element |
| reset | onreset | Form is reset |
| resize | onresize | Object is being resized |
| scroll | onscroll | User moves an object's scroll bar |
| select | onselect | Text in text field is selected |
| submit | onsubmit | Form is submitted |
| unload | onunload | Window or frame has unloaded |
额外的浏览器事件
