milestone 23 s3: move srOnly into the shared style vocabulary

web/src/ui/styles.ts

@@ -151,6 +151,19 @@ export const styles = stylex.create({
 		color: colors.dangerText,
 	},
 
+	/** Visible to a screen reader only; the element keeps its place in the a11y tree. */
+	srOnly: {
+		position: "absolute",
+		width: 1,
+		height: 1,
+		padding: 0,
+		margin: -1,
+		overflow: "hidden",
+		clipPath: "inset(50%)",
+		whiteSpace: "nowrap",
+		borderWidth: 0,
+	},
+
 	th: {
 		borderBottomWidth: 1,
 		borderBottomStyle: "solid",