Add test to check painting order of mrow-like elements. (#24162)
https://github.com/mathml-refresh/mathml/issues/52
diff --git a/mathml/presentation-markup/mrow/mrow-painting-order-ref.html b/mathml/presentation-markup/mrow/mrow-painting-order-ref.html
new file mode 100644
index 0000000..7269495
--- /dev/null
+++ b/mathml/presentation-markup/mrow/mrow-painting-order-ref.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<html>
+ <head>
+ <meta charset="utf-8">
+ <title>mrow painting order (reference)</title>
+ <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+ <style>
+ .container {
+ position: absolute;
+ left: 2em;
+ top: 10em;
+ }
+ math {
+ font: 50px/1 Ahem;
+ }
+ .hidden {
+ visibility: hidden;
+ }
+ </style>
+ </head>
+ <body>
+ <p>This test passes if there is no red and content is stacked such that</p>
+ <ul>
+ <li>foreground (dark colors) is above background (light colors)</li>
+ <li>yellow foreground is above green foreground which is itself above blue foreground</li>
+ <li>yellow background is above green background which is itself above blue background</li>
+ </ul>
+ <!-- Paint lightblue background -->
+ <div class="container">
+ <math>
+ <mrow>
+ <mrow style="background: lightblue"><mn class="hidden">XXÉ</mn></mrow>
+ </mrow>
+ </math>
+ </div>
+ <!-- Paint lightgreen background -->
+ <div class="container">
+ <math>
+ <mrow>
+ <mn class="hidden">XXÉX</mn>
+ <mrow style="background: lightgreen; margin-inline-start: -3em"><mn style="visibility: hidden">p XXÉ</mn></mrow>
+ </mrow>
+ </math>
+ </div>
+ <!-- Paint lightyellow background -->
+ <div class="container">
+ <math>
+ <mrow>
+ <mn class="hidden">XXÉX</mn>
+ <mn class="hidden" style="margin-inline-start: -3em">p XXÉX</mn>
+ <mrow style="background: lightyellow; margin-inline-start: -3em"><mn style="visibility: hidden">p X</mn></mrow>
+ </mrow>
+ </math>
+ </div>
+ <!-- Paint blue foreground -->
+ <div class="container">
+ <math>
+ <mrow>
+ <mn style="color: blue;">XXÉ</mn>
+ </mrow>
+ </math>
+ </div>
+ <!-- Paint green foreground -->
+ <div class="container">
+ <math>
+ <mrow>
+ <mn class="hidden">XXÉX</mn>
+ <mn style="color: green; margin-inline-start: -3em">p XXÉ</mn>
+ </mrow>
+ </math>
+ </div>
+ <!-- Paint yellow foreground -->
+ <div class="container">
+ <math>
+ <mrow>
+ <mn class="hidden">XXÉX</mn>
+ <mn class="hidden" style="margin-inline-start: -3em">p XXÉX</mn>
+ <mn style="color: yellow; margin-inline-start: -3em">p X</mn>
+ </mrow>
+ </math>
+ </div>
+ </body>
+</html>
diff --git a/mathml/presentation-markup/mrow/mrow-painting-order.html b/mathml/presentation-markup/mrow/mrow-painting-order.html
new file mode 100644
index 0000000..b221ec8
--- /dev/null
+++ b/mathml/presentation-markup/mrow/mrow-painting-order.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+ <head>
+ <meta charset="utf-8">
+ <title>mrow painting order</title>
+ <link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.mfenced">
+ <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#stacking-contexts">
+ <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#horizontally-group-sub-expressions-mrow">
+ <meta name="assert" content="Verify in which order the children paint">
+ <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+ <link rel="match" href="mrow-painting-order-ref.html">
+ <style>
+ .container {
+ position: absolute;
+ left: 2em;
+ top: 10em;
+ }
+ math {
+ font: 50px/1 Ahem;
+ }
+ </style>
+ </head>
+ <body>
+ <p>This test passes if there is no red and content is stacked such that</p>
+ <ul>
+ <li>foreground (dark colors) is above background (light colors)</li>
+ <li>yellow foreground is above green foreground which is itself above blue foreground</li>
+ <li>yellow background is above green background which is itself above blue background</li>
+ </ul>
+ <div class="container">
+ <math>
+ <mrow>
+ <mn style="color: blue; background: lightblue">XXÉ</mn>
+ <mn style="color: red">X</mn>
+ <mn style="color: green; background: lightgreen; margin-inline-start: -3em">p XXÉ</mn>
+ <mn style="color: red">X</mn>
+ <mn style="color: yellow; background: lightyellow; margin-inline-start: -3em">p X</mn>
+ </mrow>
+ </math>
+ </div>
+ </body>
+</html>
