lEach element in a document is considered to be a rectangular box consisting of content area, padding, a border and margins
The Box Model in DOM(HTML)
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分类目录归档：Internet
Five Tips to Help You Stay Safer on the Web
1. Keep your computer up to date and install anti-virus.
2. Make sure you’re running a modern browser like Internet Explorer 9
3. Look for the lock in the address bar of your browser for online shops
4. Look for the warning signs from your browser.
5. If you’re doing all of your shopping on a few sites, just pin them to your Windows 7 taskbar.