"Leave the web better than you found it" principle. (#362)

* Adding "leave the web better" principle

* Update index.bs

wrote some straw man text for this...

* Update index.bs

* Update index.bs

* Update index.bs

Co-authored-by: Rossen Atanassov <[email protected]>

* Update index.bs

Co-authored-by: Rossen Atanassov <[email protected]>

* Update index.bs

* Update index.bs

Co-authored-by: Peter Linss <[email protected]>

* Update index.bs

Co-authored-by: Rossen Atanassov <[email protected]>

* Update index.bs

Co-authored-by: Peter Linss <[email protected]>

* Update index.bs

* Update index.bs

* Update index.bs

Match tense

Co-authored-by: Rossen Atanassov <[email protected]>
Co-authored-by: Peter Linss <[email protected]>

Author: 3 people

index.bs

@@ -263,6 +263,19 @@ so that it works across screen sizes,
 and allows users to choose their own font and font size without causing text to overflow.
 </div>
 
+<h3 id="leave-the-web-better">Leave the web better than you found it</h3>
+
+As you add new capabilities to the web platform, do so in a way that improves
+the overall platform, for example its security or privacy vulnerabilities, or accessibility characteristics. 
+The existence of a defect in one part of the platform must not be used as a license 
+for adding or extending such defect into new capabilities and thereby further decreasing 
+the overall platform quality.  Where possible, build new web capabilities that 
+improve the overall platform quality.
+
+Parts of the web platform evolve independently.  
+Issues that are present with a certain web technology now may be fixed in a subsequent iteration.  
+Duplicating these issues makes fixing them more difficult. 
+By adhering to this principle we can make sure overall platform quality improves over time.
 <h2 id="api-across-languages">API Design Across Languages</h2>
 
 <h3 id="simplicity">Prefer simple solutions</h3>