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试用：所有元素的 box-sizing
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<!DOCTYPE html> <html> <head> <style> body { margin: 0; } * { box-sizing: border-box; } input, textarea { width: 100%; } </style> </head> <body> <form action="/action_page.php"> First name:<br> <input type="text" name="firstname" value="Mickey"><br> Last name:<br> <input type="text" name="lastname" value="Mouse"><br> Comments:<br> <textarea name="message" rows="5" cols="30"> </textarea> <br><br> <input type="submit" value="Submit"> </form> <p><strong>Tip:</strong> Try to remove the box-sizing property from the style element and look what happens. Notice that the width of input, textarea, and submit button will go outside of the screen.</p> </body> </html>
