Every time you choose to apply a rule(s), explicitly state the rule(s) in the output. You can abbreviate the rule description to a single word or phrase.
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| <!-- Declare HTML5 DOCTYPE. This is needed because Bootstrap will no work if the DOCTYPE isn't HTML5 --> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Registration Form</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <!-- Include Bootstrap CSS from CDN --> | |
| <link href="https://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet"> |