converting-html-css-to-wpf-xaml

Use Border.Clip with a RectangleGeometry whose RadiusX/RadiusY match the CornerRadius, and bind its Rect to ActualWidth/ActualHeight through a SizeToRectConverter. ClipToBounds alone only clips to a rectangle and ignores rounded corners.

Map animation-duration to an inline Duration like "0:0:3", animation-iteration-count: infinite to RepeatBehavior="Forever", and @keyframes from/to to From/To values. Never bind Duration via StaticResource because TimeSpan does not auto-convert to the Duration type.

Grid determines child sizes at layout time and clips elements that rotate outside its bounds. Place rotating elements inside a Canvas with Canvas.Left/Canvas.Top positioning, since Canvas does not restrict child sizes and allows free rotation rendering.

WPF has no pseudo-elements, so implement them as elements inside a Canvas, using declaration order or Panel.ZIndex to control z-order. Keep the ContentPresenter outside the Canvas in a Grid so alignment properties still work.

A rotating bar must exceed the container's diagonal length, not just 130% of its height. Use a multiplier of 2.0 via a HeightMultiplierConverter and center it with a CenterOffsetConverter so the bar reaches every corner during rotation.

No. OpacityMask only adjusts transparency and does not perform layout clipping, so content still renders outside the rounded region. Use Border.Clip with RectangleGeometry for true geometric clipping.