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URL shortening services are used by millions of people on daily basis as they a serve very important purposes in areas like social networking and internet marketing and are extremely useful in Internet conversations on services like twitter when someone want to share a link. With only 140 characters available to deliver the message a normal link can take up most of the space.
By Matthew Steele and Bryan McQuade, PageSpeed Insights Team
Keep this cheatsheet handy — it contains the most common HTML tags and their proper syntax. Basic Tags