First release

node_modules/hint.css/src/hint-core.scss

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+/**
+ * source: hint-core.scss
+ *
+ * Defines the basic styling for the tooltip.
+ * Each tooltip is made of 2 parts:
+ * 	1) body (:after)
+ * 	2) arrow (:before)
+ *
+ * Classes added:
+ * 	1) hint
+ */
+
+[class*="#{$hintPrefix}"] {
+	position: relative;
+	display: inline-block;
+
+	&:before, &:after {
+		position: absolute;
+
+		// HACK: Trigger hardware accelerated rendering, otherwise transform was not
+		// working on a hidden element
+		@include vendor('transform', translate3d(0, 0, 0));
+
+		// HACK: visibility is set to hidden because IE & Opera don't support
+		// pointer-events on HTML content yet because of which hovering a hidden tooltip
+		// shows the tooltip.
+		visibility: hidden;
+		opacity: 0;
+		z-index: $hintZIndex;
+		// shouldn't receive pointer events, otherwise even hovering tooltip will make it appear
+		pointer-events: none;
+
+		@include vendor('transition', $hintTransitionDuration ease);
+		@include vendor('transition-delay', $hintHideDelay);
+	}
+
+	&:hover:before, &:hover:after {
+		visibility: visible;
+		opacity: 1;
+	}
+
+	&:hover:before, &:hover:after {
+		// $hintShowDelay will apply as soon as element is hovered.
+		@include vendor('transition-delay', $hintShowDelay);
+	}
+
+	/**
+	 * tooltip arrow
+	 */
+	&:before {
+		content: '';
+		position: absolute;
+		background: transparent;
+		border: $hintArrowBorderWidth solid transparent;
+		// move z-index 1 up than :after so that it shows over box-shadow
+		z-index: $hintZIndex + 1;
+	}
+
+	/**
+	 * tooltip body
+	 */
+	&:after {
+		background: $hintDefaultColor;
+		color: white;
+		padding: $hintVerticalPadding $hintHorizontalPadding;
+		font-size: $hintFontSize;
+		font-family: $hintFontFamily;
+		line-height: $hintFontSize; // Vertical centering.
+		white-space: nowrap; // Prevent breaking to new line.
+	}
+	// Always get content from aria-label attribute.
+	&[aria-label]:after {
+		content: attr(aria-label); // The magic!
+	}
+	// If the `data-hint` attribute is present, use it.
+	// This might be deprecated in future in support of a11y.
+	&[data-hint]:after {
+		content: attr(data-hint); // The magic!
+	}
+}
+
+// Hide tooltips if any of the supported attributes is empty.
+[aria-label=''],
+[data-hint=''] {
+	&:before, &:after {
+		display: none !important;
+	}
+}