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custom-style-properties#547497

<cat>Dev.UI</cat> <title>Custom Style Properties</title> We've added a few custom style properties to our implementation of css. Your editor might complain that these don't exist, but they do. Here's what we added | Name | Description / Notes | |-------------------|-----| | aspect-ratio | float: Added by Facebook Flexbox. Element tries to keep its aspect ratio. | | background-image-tint | Color: multiplies the background image by this color | | sound-in | The name of a sound to play when this style is applied to an element for the first time. This is useful to put on a:hover style to play a sound when hovering. | | sound-out | The name of a sound to play when this style is removed from an element for the first time | | pixel-snap | If set to 1 we'll snap the UI to pixels. If your element is on screen, you probably want to snap to pixels. If it's something like an over-head name tag, something that follows the position of something in the world, you want to set this to 0. This property cascades automatically and defaults to 1. |⤶ | text-stroke | This will put an outline around text. This property is the same as the non-standard [-webkit-text-stroke property](https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-stroke), and follows the same syntax: `text-stroke: size colour` | # Custom pseudo-classes There are also some custom pseudo-classes for applying transitions when an element is created or deleted. * `:intro` - is removed when the element is created, things will transition away from this. * `:outro` - is added when Panel.Delete() is called, the Panel waits for all transitions to finish before actually deleting itself. ``` mypanel { transition: all 2s ease-out; transform: scale( 1 ); // When the element is created make it expand from nothing. &:intro { transform: scale( 0 ); } // When the element is deleted make it double in size before being deleted. &:outro { transform: scale( 2 ); } } ```