## Major themes

Kubernetes is developed by community members whose work is organized into
[Special Interest Groups](https://github.com/kubernetes/community/blob/master/sig-list.md), which provide the themes that guide their work. For the 1.9 release, these themes included:

### API Machinery

Extensibility. SIG API Machinery added a new class of admission control webhooks (mutating), and brought the admission control webhooks to beta.

1F9A5..1F9AA  ; valid                  ;      ; NV8    # 12.0 SLOTH..OYSTER
1F9AB..1F9AD  ; valid                  ;      ; NV8    # 13.0 BEAVER..SEAL
1F9AE..1F9AF  ; valid                  ;      ; NV8    # 12.0 GUIDE DOG..PROBING CANE
1F9B0..1F9B9  ; valid                  ;      ; NV8    # 11.0 EMOJI COMPONENT RED HAIR..SUPERVILLAIN
1F9BA..1F9BF  ; valid                  ;      ; NV8    # 12.0 SAFETY VEST..MECHANICAL LEG

rch\"] {\n  outline-offset: -2px; // 1\n  -webkit-appearance: textfield; // 2\n}\n\n// 1. A few input types should stay LTR\n// See https://rtlstyling.com/posts/rtl-styling#form-inputs\n// 2. RTL only output\n// See https://rtlcss.com/learn/usage-guide/control-directives/#raw\n\n/* rtl:raw:\n[type=\"tel\"],\n[type=\"url\"],\n[type=\"email\"],\n[type=\"number\"] {\n  direction: ltr;\n}\n*/\n\n// Remove the inner padding in Chrome and Safari on macOS.\n\n::-webkit-search-decoration {\n  -webkit-appearance:...