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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
| commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
| tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /layout/reftests/scrolling/percent-height-overflowing-image-1.html | |
| parent | Initial commit. (diff) | |
| download | thunderbird-upstream.tar.xz thunderbird-upstream.zip | |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | layout/reftests/scrolling/percent-height-overflowing-image-1.html | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/layout/reftests/scrolling/percent-height-overflowing-image-1.html b/layout/reftests/scrolling/percent-height-overflowing-image-1.html new file mode 100644 index 0000000000..fbb9b12154 --- /dev/null +++ b/layout/reftests/scrolling/percent-height-overflowing-image-1.html @@ -0,0 +1,71 @@ +<!DOCTYPE html> +<head> + <meta charset="utf-8"> + <title>Testcase for %-height potentially-overflowing images</title> + <!-- This test exercises a series of scenarios where the presence of + scrollbars affects the layout in a way that may make those scrollbars + unnecessary. Specifically, we have a series of examples here + with a scrollable div, where... + - The child's width depends on its container's height, via + its aspect ratio and via having a percent-height. + - *Without* scrollbars, the child is too wide and causes horizontal + overflow. + - If we *add* a horizontal scrollbar (which occupies vertical space), + the child's height is reduced (on platforms where scrollbars take up + space) and so its width is reduced as well, and it might not + cause horizontal overflow beyond its parent's border-box anymore. + This creates a bit of a paradox. We resolve it by opting to show + scrollbars, to be on the safe side & to make sure that we don't + have any unreachable content. + --> + <style> + .container { + overflow: auto; + height: 80px; + border: 2px solid purple; + margin: 1px; + display: inline-block; + } + .percent-size { + display: block; + height: 100%; + border: 2px solid black; + box-sizing: border-box; + } + </style> +</head> +<body> + <!-- Here, the div is extremely skinny; there'll definitely be horizontal + overflow (but not vertical), so we should just show the horizontal + scrollbar: --> + <div class="container" style="width: 50px; height: 120px"> + <img class="percent-size" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAADklEQVQImWP4DwUMMAAAa6YH+b3nj3MAAAAASUVORK5CYII="> + </div> + <div class="container" style="width: 60px; height: 120px"> + <img class="percent-size" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAADklEQVQImWP4DwUMMAAAa6YH+b3nj3MAAAAASUVORK5CYII="> + </div> + <br> + + <!-- Here, the div is nearly wide enough to avoid overflow, but not quite. On + platforms where scrollbars occupy layout-space, the presence of any + horizontal scrollbar here will reduce the height of the child, and (via + the child's aspect ratio) reduce the width of the child, such that the + child ends up skinnier than the parent's width and won't overflow the + parent's border-box anymore. We resolve this by just throwing up our + hands and showing *both* scrollbars (horizontal and vertical). --> + <div class="container" style="width: 78px"> + <img class="percent-size" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAADklEQVQImWP4DwUMMAAAa6YH+b3nj3MAAAAASUVORK5CYII="> + </div> + <div class="container" style="width: 79px"> + <img class="percent-size" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAADklEQVQImWP4DwUMMAAAa6YH+b3nj3MAAAAASUVORK5CYII="> + </div> + <br> + + <!-- Here, the div is wide enough so that no scrollbars are needed. --> + <div class="container" style="width: 80px"> + <img class="percent-size" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAADklEQVQImWP4DwUMMAAAa6YH+b3nj3MAAAAASUVORK5CYII="> + </div> + <div class="container" style="width: 90px"> + <img class="percent-size" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAADklEQVQImWP4DwUMMAAAa6YH+b3nj3MAAAAASUVORK5CYII="> + </div> +</body> |