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Implement background-position keyword values

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Also fixes calculation of background-position percentages:

Rather than multiplying the container size by a percent and aligning the top
left of the image at the resulting width, we also need to subtract a
corresponding percent of the image size, per
http://dev.w3.org/csswg/css2/colors.html#propdef-background-position

"A value pair of '100% 100%' places the lower right corner of the image in the
lower right corner of the padding box. With a value pair of '14% 84%', the
point 14% across and 84% down the image is to be placed at the point 14%
across and 84% down the padding box."
This commit is contained in:
Matt Brubeck 2014-09-11 17:12:25 -07:00
parent 66a7de750c
commit 6c9524b687
9 changed files with 258 additions and 50 deletions
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tests/ref/100x100_green.png Normal file
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tests/ref/background_position_keyword.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>You see here a scroll labeled FOOBIE BLETCH.</title>
<style>
#foo {
background: url(400x400_green.png);
background-position: right top;
background-repeat: no-repeat;
width: 528px;
height: 400px;
margin-left: 0;
}
</style>
</head>
<body>
<div id=foo></div>
</body>
</html>

20
tests/ref/background_position_percent.html Normal file
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@ -0,0 +1,20 @@
<!DOCTYPE html>
<html>
<head>
<title>You see here a scroll labeled FOOBIE BLETCH.</title>
<style>
#foo {
background: url(400x400_green.png);
background-position: 100% 0%;
background-repeat: no-repeat;
width: 528px;
height: 400px;
margin-left: 0;
}
</style>
</head>
<body>
<div id=foo></div>
</body>
</html>

29
tests/ref/background_position_shorthand.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>background shorthand test</title>
<style>
div {
float: left; /* So all the divs are visible in the test viewport */
width: 200px;
height: 200px;
}
/* test different orders for background position */
#a { background: red url(100x100_green.png) no-repeat right center; }
#b { background: red url(100x100_green.png) no-repeat center right; }
#c { background: right center red url(100x100_green.png) no-repeat; }
#d { background: red url(100x100_green.png) right center no-repeat; }
#e { background: red url(100x100_green.png) no-repeat right; }
#f { background: right red url(100x100_green.png) no-repeat; }
</style>
</head>
<body>
<div id="a"></div>
<div id="b"></div>
<div id="c"></div>
<div id="d"></div>
<div id="e"></div>
<div id="f"></div>
</body>
</html>

31
tests/ref/background_position_shorthand_ref.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>background shorthand test</title>
<style>
.outer {
float: left;
background-color: red;
width: 200px;
height: 200px;
}
.inner {
background-image: url(100x100_green.png);
width: 100px;
height: 100px;
position: relative;
top: 50px;
left: 100px;
}
</style>
</head>
<body>
<div class="outer"><div class="inner"></div></div>
<div class="outer"><div class="inner"></div></div>
<div class="outer"><div class="inner"></div></div>
<div class="outer"><div class="inner"></div></div>
<div class="outer"><div class="inner"></div></div>
<div class="outer"><div class="inner"></div></div>
</body>
</html>

3
tests/ref/basic.list
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@ -67,6 +67,9 @@
== min_max_height_a.html min_max_height_b.html
== minimum_line_height_a.html minimum_line_height_b.html
== background_position_a.html background_position_b.html
== background_position_keyword.html background_position_b.html
== background_position_percent.html background_position_b.html
== background_position_shorthand.html background_position_shorthand_ref.html
== background_repeat_x_a.html background_repeat_x_b.html
== background_repeat_y_a.html background_repeat_y_b.html
== background_repeat_none_a.html background_repeat_none_b.html