¿cómo funcionan los certificados X.509 de validación extendida?

enlace utiliza un certificado de validación extendido. la entrada de wikipedia.org en certificados de validación ampliados dice que se sabe que un certificado es un certificado de validación extendido si el OID está en La extensión de las políticas de certificado es del valor apropiado.

¿Cómo sabe el navegador cuál es el valor apropiado? Esto es lo que muestra Google Chrome para el certificado raíz en la cadena:

ElcampodeValidaciónextendidapareceprometedor.Alhacer"openssl x509 -in cert.pem -noout -text" aparece lo siguiente:

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 0 (0x0)
        Signature Algorithm: sha1WithRSAEncryption
        Issuer: C=US, O=The Go Daddy Group, Inc., OU=Go Daddy Class 2 Certificat
ion Authority
        Validity
            Not Before: Jun 29 17:06:20 2004 GMT
            Not After : Jun 29 17:06:20 2034 GMT
        Subject: C=US, O=The Go Daddy Group, Inc., OU=Go Daddy Class 2 Certifica
tion Authority
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
            RSA Public Key: (2048 bit)
                Modulus (2048 bit):
                    00:de:9d:d7:ea:57:18:49:a1:5b:eb:d7:5f:48:86:
                    ea:be:dd:ff:e4:ef:67:1c:f4:65:68:b3:57:71:a0:
                    5e:77:bb:ed:9b:49:e9:70:80:3d:56:18:63:08:6f:
                    da:f2:cc:d0:3f:7f:02:54:22:54:10:d8:b2:81:d4:
                    c0:75:3d:4b:7f:c7:77:c3:3e:78:ab:1a:03:b5:20:
                    6b:2f:6a:2b:b1:c5:88:7e:c4:bb:1e:b0:c1:d8:45:
                    27:6f:aa:37:58:f7:87:26:d7:d8:2d:f6:a9:17:b7:
                    1f:72:36:4e:a6:17:3f:65:98:92:db:2a:6e:5d:a2:
                    fe:88:e0:0b:de:7f:e5:8d:15:e1:eb:cb:3a:d5:e2:
                    12:a2:13:2d:d8:8e:af:5f:12:3d:a0:08:05:08:b6:
                    5c:a5:65:38:04:45:99:1e:a3:60:60:74:c5:41:a5:
                    72:62:1b:62:c5:1f:6f:5f:1a:42:be:02:51:65:a8:
                    ae:23:18:6a:fc:78:03:a9:4d:7f:80:c3:fa:ab:5a:
                    fc:a1:40:a4:ca:19:16:fe:b2:c8:ef:5e:73:0d:ee:
                    77:bd:9a:f6:79:98:bc:b1:07:67:a2:15:0d:dd:a0:
                    58:c6:44:7b:0a:3e:62:28:5f:ba:41:07:53:58:cf:
                    11:7e:38:74:c5:f8:ff:b5:69:90:8f:84:74:ea:97:
                    1b:af
                Exponent: 3 (0x3)
        X509v3 extensions:
            X509v3 Subject Key Identifier:
                D2:C4:B0:D2:91:D4:4C:11:71:B3:61:CB:3D:A1:FE:DD:A8:6A:D4:E3
            X509v3 Authority Key Identifier:
                keyid:D2:C4:B0:D2:91:D4:4C:11:71:B3:61:CB:3D:A1:FE:DD:A8:6A:D4:E
3
                DirName:/C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Cer
tification Authority
                serial:00

            X509v3 Basic Constraints:
                CA:TRUE
    Signature Algorithm: sha1WithRSAEncryption
        32:4b:f3:b2:ca:3e:91:fc:12:c6:a1:07:8c:8e:77:a0:33:06:
        14:5c:90:1e:18:f7:08:a6:3d:0a:19:f9:87:80:11:6e:69:e4:
        96:17:30:ff:34:91:63:72:38:ee:cc:1c:01:a3:1d:94:28:a4:
        31:f6:7a:c4:54:d7:f6:e5:31:58:03:a2:cc:ce:62:db:94:45:
        73:b5:bf:45:c9:24:b5:d5:82:02:ad:23:79:69:8d:b8:b6:4d:
        ce:cf:4c:ca:33:23:e8:1c:88:aa:9d:8b:41:6e:16:c9:20:e5:
        89:9e:cd:3b:da:70:f7:7e:99:26:20:14:54:25:ab:6e:73:85:
        e6:9b:21:9d:0a:6c:82:0e:a8:f8:c2:0c:fa:10:1e:6c:96:ef:
        87:0d:c4:0f:61:8b:ad:ee:83:2b:95:f8:8e:92:84:72:39:eb:
        20:ea:83:ed:83:cd:97:6e:08:bc:eb:4e:26:b6:73:2b:e4:d3:
        f6:4c:fe:26:71:e2:61:11:74:4a:ff:57:1a:87:0f:75:48:2e:
        cf:51:69:17:a0:02:12:61:95:d5:d1:40:b2:10:4c:ee:c4:ac:
        10:43:a6:a5:9e:0a:d5:95:62:9a:0d:cf:88:82:c5:32:0c:e4:
        2b:9f:45:e6:0d:9f:28:9c:b1:b9:2a:5a:57:ad:37:0f:af:1d:
        7f:db:bd:9f

No veo nada que se parezca al campo de Validación extendida en el análisis de la certificación de openssl ...