Update F81

techniques/failures/F81.html

@@ -1,14 +1,17 @@
 Failure of Success Criterion 1.4.1 due to identifying required or error fields using color differences onlyFailure of Success Criterion 1.4.1 due to identifying required or error fields using color differences onlyID: F81Technology: failuresType: FailureWhen to Use
       All technologies
    Description
-      This objective of this technique is to describe the failure that occurs when a required field or an error field is marked with color differences only, without an alternate way to identify the required field or error field. This can cause problems for people who are blind or colorblind, because they may not be able to perceive the color differences that indicate which field is required or which field is causing an error.
+      This objective of this technique is to describe the failure that occurs when a required field or an error field is marked with color differences only, without an alternate way to identify the required field or error field. This can cause problems for people who colorblind, because they may not be able to perceive the color differences that indicate which field is required or which field is causing an error.
    Examples
       
-         A user is completing an online form, and the phone number field is required. To indicate that the phone number field is required, the label "Phone Number" is displayed in a color different from the color used for optional fields, without any other indication that "Phone Number" is a required field. A blind or colorblind user may not be able to identify that "Phone Number" is a required field.
+         A user is completing an online form, and the phone number field is required. To indicate that the phone number field is required, the label "Phone Number" is displayed in a color different from the color used for optional fields, without any other indication that "Phone Number" is a required field. A colorblind user may not be able to identify that "Phone Number" is a required field.
          A user submits an online form and leaves a required field blank, resulting in an error. The form field that caused the error is indicated by red text only, without an additional non-color indication that the field caused an error.
       
       
-         In both examples, the color could be used without failure if the text was sufficiently different in visual presentation (e.g. bold or in a different font) that it would be easily differentiated from the surrounding text if the color were removed. It would also not fail if the color chosen had sufficient luminosity difference (lightness) from the other text that it would be easily be seen as different if viewed in black and white.  In these cases - the information would not be displayed in color (hue) alone but also in "presentation" or "lightness" respectively. 
+         In both examples, the color could be used without failure if the text was sufficiently different in visual presentation (e.g. bold or in a different font) that it would be easily differentiated from the surrounding text if the color were removed. It would also not fail if the color chosen had sufficient luminosity difference (lightness) from the other text that it would be easily be seen as different if viewed in black and white. A minimum contrast ratio of 3:1 is considered sufficient. In these cases - the information would not be displayed in color (hue) alone but also in "presentation" or "lightness" respectively. 
+      
+      
+         For users of assistive technology, required or error fields must also be perceptible. This is checked with the SCs 1.3.1 and 3.3.1.
       
    Tests
       Procedure