you wrote '' instead of " in pattern="[0-9]{10}"
this code works:
<!DOCTYPE html><html>
<head>
<title>
Forms in HTML5 :)
</title>
</head>
<body>
<form align="center">Name:<input type="text" autocomplete><br><br>
Email:<input type="email" name="email"><br><br>
Date of Inception:<input type="time" name="usr_time"><br><br>
Number of years completed(between 1 and 100):<input type="number" min="1"
max="100"><br><br>
Office phone number: <input type="tel" id="phone" name="phone" pattern="[0-9].
{10}" required><br><br>
Add your homepage:
<input type="url" name="homepage"><br><br>
<input type="image" src="E:/HTML1/SUBMIT-BUTTON.png" height="60" width="180"
alt="click here to submit">
</form>
</body>
</html>
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