Japan 2021 LT Experimental Features デフォルトOnの項目 Aspect ratio of <img> from width and height Intersection Observer Synthetic Editing Commands Async clipboard API Mask WebGL Strings TransformStream API Blank anchor target implies rel=noopener Media Capabilities Extensions UserGesture Promise Propagation Block top-level redirects by third party iframes MediaRecorder Visual Viewport API CSS Individual Transform Properties Modern WebAudio API Web Authentication Modern Defer async scripts until DOMContentLoaded or first-paint Paint Timing Web Authentication Disable WebSQL Quirk to prevent delayed initial painting on sites using Google’s Anti-Flick... WebAudio AudioWorklet API Disallow sync XHR during page dismissal Referrer Policy attribute WebRTC H264 LowLatency encoder Fetch API Request KeepAlive Remote Playback API WebRTC Platform Sockets Generic Text Track Cue API Resize Observer Wheel Event gestures become non-blocking HDR Media Capabilities SpeechRecognition API Wheel Event listeners on the root made passive In-Process Cookie Cache Swap Processes on Cross-Site Navigation WritableStream API ※ iOS 14.7.1 時点