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| -rw-r--r-- | layout/reftests/css-transitions/stacking-context-transform-wins-over-important-style.html | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/layout/reftests/css-transitions/stacking-context-transform-wins-over-important-style.html b/layout/reftests/css-transitions/stacking-context-transform-wins-over-important-style.html new file mode 100644 index 0000000000..4d31df27ad --- /dev/null +++ b/layout/reftests/css-transitions/stacking-context-transform-wins-over-important-style.html @@ -0,0 +1,40 @@ +<!DOCTYPE html> +<html class="reftest-wait"> +<title> +Transform transition winning over !important rule creates a stacking context +</title> +<style> +span { + height: 100px; + width: 100px; + position: fixed; + background: green; + top: 50px; +} +#test { + width: 100px; height: 100px; + background: blue; + /* + * On the compositor we use a previous vsync time stamp rather than the + * current time stamp, as a result sometimes transition may be still in + * before phase after waiting a frame. To compose the same transform value + * regardless of whether the transition is in before or active phase, we use + * steps(1, end) here. + */ + transition: transform 100s steps(1, end); + transform: none ! important; +} +</style> +<span></span> +<div id="test"></div> +<script> +window.addEventListener("load", () => { + var target = document.getElementById("test"); + getComputedStyle(target).transform; + + target.style.setProperty("transform", "translateX(200px)", "important"); + getComputedStyle(target).transform; + + document.documentElement.classList.remove("reftest-wait"); +}); +</script> |