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chromium/third_party/blink/web_tests/scrollbars/listbox-scrollbar-combinations.html 

<head>
<style>
body {
    -webkit-user-select: none;
}

body > select {
    padding: 10px;
    margin: 20px;
    display: inline-block;
    border: 1px solid lightgray;
    -webkit-box-sizing: border-box;
    vertical-align: top;
    color: rgb(220, 220, 220);
    background-color: rgb(113, 141, 147);
    font-family: Verdana, sans-serif;
    font-size: 12px;
    -webkit-user-select: text;
    width: 125px;
    height: 100px;
}

option[selected] {
    background-color: rgb(130, 170, 170);
    color: rgb(235, 235, 235);
}

::-webkit-scrollbar {
    width: 13px;
    height: 13px;
}

::-webkit-scrollbar-corner {
    background-image: url(resources/corner.png);
    background-repeat: no-repeat;
}

::-webkit-scrollbar-corner:window-inactive {
    background-image: url(resources/corner-inactive.png);
}

::-webkit-resizer {
    background-image: url(resources/resizer.png);
    background-repeat: no-repeat;
    background-position: bottom right;
}

::-webkit-resizer:window-inactive {
    background-image: url(resources/resizer-inactive.png);
}

::-webkit-scrollbar-track-piece:disabled {
    display: none !important;
}

::-webkit-scrollbar-button:disabled {
    display: none !important;
}

::-webkit-scrollbar-track:disabled {
    margin: 6px;
}

/* Horizontal Scrollbar Styles */

::-webkit-scrollbar:horizontal {
    -webkit-border-image: url(resources/horizontal-button.png) 0 2 0 2;
    border-color: transparent;
    border-width: 0 2px;
    background-image: url(resources/horizontal-button-background.png);
    background-repeat: repeat-x;
    border-style: solid;
}

::-webkit-scrollbar:horizontal:corner-present {
    border-right-width: 0;
}

::-webkit-scrollbar-track:horizontal:disabled:corner-present {
    margin-right: 5px;
}

::-webkit-scrollbar:horizontal:window-inactive {
    -webkit-border-image: url(resources/horizontal-button-inactive.png) 0 2 0 2;
    background-image: url(resources/horizontal-button-background-inactive.png);
    border-style: solid;
}

::-webkit-scrollbar-thumb:horizontal {
    -webkit-border-image: url(resources/horizontal-thumb.png) 0 13 0 13;
    border-color: transparent;
    border-width: 0 13px;
    min-width: 20px;
    border-style: solid;
}

::-webkit-scrollbar-thumb:horizontal:hover {
    -webkit-border-image: url(resources/horizontal-thumb-hover.png) 0 13 0 13;
    border-style: solid;
}

::-webkit-scrollbar-thumb:horizontal:active {
    -webkit-border-image: url(resources/horizontal-thumb-active.png) 0 13 0 13;
    border-style: solid;
}

::-webkit-scrollbar-thumb:horizontal:window-inactive {
    -webkit-border-image: url(resources/horizontal-thumb-inactive.png) 0 13 0 13;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:horizontal:start:no-button,
.double-end::-webkit-scrollbar-track-piece:horizontal:start,
.none::-webkit-scrollbar-track-piece:horizontal:start {
    margin-left: 6px;
}

::-webkit-scrollbar-track-piece:horizontal:end:no-button,
.double-start::-webkit-scrollbar-track-piece:horizontal:end,
.none::-webkit-scrollbar-track-piece:horizontal:end {
    margin-right: 6px;
}

::-webkit-scrollbar-track-piece:horizontal:end:no-button:corner-present,
.double-start::-webkit-scrollbar-track-piece:horizontal:end:corner-present,
.none::-webkit-scrollbar-track-piece:horizontal:end:corner-present {
    margin-right: 5px;
}

:not(.none):not(.double-end)::-webkit-scrollbar-track-piece:horizontal:start:single-button,
:not(.none):not(.double-end)::-webkit-scrollbar-track-piece:horizontal:start:double-button,
.single::-webkit-scrollbar-track-piece:horizontal:start,
.double-start::-webkit-scrollbar-track-piece:horizontal:start,
.double-both::-webkit-scrollbar-track-piece:horizontal:start {
    margin-left: -6px;
}

:not(.none):not(.double-start)::-webkit-scrollbar-track-piece:horizontal:end:single-button,
:not(.none):not(.double-start)::-webkit-scrollbar-track-piece:horizontal:end:double-button,
.single::-webkit-scrollbar-track-piece:horizontal:end,
.double-end::-webkit-scrollbar-track-piece:horizontal:end,
.double-both::-webkit-scrollbar-track-piece:horizontal:end {
    margin-right: -6px;
}

::-webkit-scrollbar-track:horizontal:disabled {
    -webkit-border-image: url(resources/horizontal-track-disabled.png) 0 13 0 13;
    border-color: transparent;
    border-width: 0 13px;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:horizontal:decrement {
    -webkit-border-image: url(resources/horizontal-track.png) 0 13 0 13;
    border-color: transparent;
    border-width: 0 0 0 13px;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:horizontal:decrement:hover {
    -webkit-border-image: url(resources/horizontal-track-hover.png) 0 13 0 13;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:horizontal:decrement:active {
    -webkit-border-image: url(resources/horizontal-track-active.png) 0 13 0 13;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:horizontal:increment {
    -webkit-border-image: url(resources/horizontal-track.png) 0 13 0 13;
    border-color: transparent;
    border-width: 0 13px 0 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:horizontal:increment:hover {
    -webkit-border-image: url(resources/horizontal-track-hover.png) 0 13 0 13;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:horizontal:increment:active {
    -webkit-border-image: url(resources/horizontal-track-active.png) 0 13 0 13;
    border-style: solid;
}

::-webkit-scrollbar-button:horizontal {
    width: 20px;
    -webkit-border-image: url(resources/horizontal-button.png) 0 2 0 2;
    border-color: transparent;
    border-width: 0 2px;
    border-style: solid;
}

::-webkit-scrollbar-button:horizontal:decrement {
    background-image: url(resources/horizontal-decrement-arrow.png), url(resources/horizontal-button-background.png);
    background-repeat: no-repeat, repeat-x;
    background-position: 2px 3px, 0 0;
}

::-webkit-scrollbar-button:horizontal:decrement:hover {
    -webkit-border-image: url(resources/horizontal-button-hover.png) 0 2 0 2;
    background-image: url(resources/horizontal-decrement-arrow.png), url(resources/horizontal-button-background-hover.png);
    border-style: solid;
}

::-webkit-scrollbar-button:horizontal:decrement:active {
    -webkit-border-image: url(resources/horizontal-button-active.png) 0 2 0 2;
    background-image: url(resources/horizontal-decrement-arrow.png), url(resources/horizontal-button-background-active.png);
    border-style: solid;
}

::-webkit-scrollbar-button:horizontal:decrement:window-inactive {
    -webkit-border-image: url(resources/horizontal-button-inactive.png) 0 2 0 2;
    background-image: url(resources/horizontal-decrement-arrow.png), url(resources/horizontal-button-background-inactive.png);
    border-style: solid;
}

::-webkit-scrollbar-button:horizontal:increment {
    background-image: url(resources/horizontal-increment-arrow.png), url(resources/horizontal-button-background.png);
    background-repeat: no-repeat, repeat-x;
    background-position: 7px 3px, 0 0;
}

::-webkit-scrollbar-button:horizontal:increment:hover {
    -webkit-border-image: url(resources/horizontal-button-hover.png) 0 2 0 2;
    background-image: url(resources/horizontal-increment-arrow.png), url(resources/horizontal-button-background-hover.png);
    border-style: solid;
}

::-webkit-scrollbar-button:horizontal:increment:active {
    -webkit-border-image: url(resources/horizontal-button-active.png) 0 2 0 2;
    background-image: url(resources/horizontal-increment-arrow.png), url(resources/horizontal-button-background-active.png);
    border-style: solid;
}

::-webkit-scrollbar-button:horizontal:increment:window-inactive {
    -webkit-border-image: url(resources/horizontal-button-inactive.png) 0 2 0 2;
    background-image: url(resources/horizontal-increment-arrow.png), url(resources/horizontal-button-background-inactive.png);
    border-style: solid;
}

:not(.single)::-webkit-scrollbar-button:double-button:horizontal:start:decrement,
.double-start::-webkit-scrollbar-button:horizontal:start:decrement,
.double-both::-webkit-scrollbar-button:horizontal:start:decrement {
    width: 14px;
    border-right-width: 0;
    background-position: 2px 3px, 0 0;
}

:not(.single)::-webkit-scrollbar-button:double-button:horizontal:start:increment,
.double-start::-webkit-scrollbar-button:horizontal:start:increment,
.double-both::-webkit-scrollbar-button:horizontal:start:increment {
    background-position: 3px 3px, 0 0;
}

:not(.single)::-webkit-scrollbar-button:double-button:horizontal:end:decrement,
.double-end::-webkit-scrollbar-button:horizontal:end:decrement,
.double-both::-webkit-scrollbar-button:horizontal:end:decrement {
    background-position: 7px 3px, 0 0;
}

:not(.single)::-webkit-scrollbar-button:double-button:horizontal:end:increment,
.double-end::-webkit-scrollbar-button:horizontal:end:increment,
.double-both::-webkit-scrollbar-button:horizontal:end:increment {
    width: 14px;
    border-left-width: 0;
    background-position: 3px 3px, 0 0;
}

::-webkit-scrollbar-button:horizontal:end:increment:corner-present {
    border-right-width: 0;
    width: 19px;
}

:not(.single)::-webkit-scrollbar-button:double-button:horizontal:end:increment:corner-present,
.double-end::-webkit-scrollbar-button:horizontal:end:increment:corner-present,
.double-both::-webkit-scrollbar-button:horizontal:end:increment:corner-present {
    width: 13px;
}

/* Vertical Scrollbar Styles */

::-webkit-scrollbar:vertical {
    -webkit-border-image: url(resources/vertical-button.png) 2 0 2 0;
    border-color: transparent;
    border-width: 2px 0;
    background-image: url(resources/vertical-button-background.png);
    background-repeat: repeat-y;
    border-style: solid;
}

::-webkit-scrollbar:vertical:corner-present {
    border-bottom-width: 0;
}

::-webkit-scrollbar-track:vertical:disabled:corner-present {
    margin-bottom: 5px;
}

::-webkit-scrollbar:vertical:window-inactive {
    -webkit-border-image: url(resources/vertical-button-inactive.png) 2 0 2 0;
    background-image: url(resources/vertical-button-background-inactive.png);
    border-style: solid;
}

::-webkit-scrollbar-thumb:vertical {
    -webkit-border-image: url(resources/vertical-thumb.png) 13 0 13 0;
    border-color: transparent;
    border-width: 13px 0;
    min-height: 20px;
    border-style: solid;
    border-style: solid;
}

::-webkit-scrollbar-thumb:vertical:hover {
    -webkit-border-image: url(resources/vertical-thumb-hover.png) 13 0 13 0;
    border-style: solid;
}

::-webkit-scrollbar-thumb:vertical:active {
    -webkit-border-image: url(resources/vertical-thumb-active.png) 13 0 13 0;
    border-style: solid;
}

::-webkit-scrollbar-thumb:vertical:window-inactive {
    -webkit-border-image: url(resources/vertical-thumb-inactive.png) 13 0 13 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:vertical:start:no-button,
.double-end::-webkit-scrollbar-track-piece:vertical:start,
.none::-webkit-scrollbar-track-piece:vertical:start {
    margin-top: 6px;
}

::-webkit-scrollbar-track-piece:vertical:end:no-button,
.double-start::-webkit-scrollbar-track-piece:vertical:end,
.none::-webkit-scrollbar-track-piece:vertical:end {
    margin-bottom: 6px;
}

::-webkit-scrollbar-track-piece:vertical:end:no-button:corner-present,
.double-start::-webkit-scrollbar-track-piece:vertical:end:corner-present,
.none::-webkit-scrollbar-track-piece:vertical:end:corner-present {
    margin-bottom: 5px;
}

:not(.none):not(.double-end)::-webkit-scrollbar-track-piece:vertical:start:single-button,
:not(.none):not(.double-end)::-webkit-scrollbar-track-piece:vertical:start:double-button,
.single::-webkit-scrollbar-track-piece:vertical:start,
.double-start::-webkit-scrollbar-track-piece:vertical:start,
.double-both::-webkit-scrollbar-track-piece:vertical:start {
    margin-top: -6px;
}

:not(.none):not(.double-start)::-webkit-scrollbar-track-piece:vertical:end:single-button,
:not(.none):not(.double-start)::-webkit-scrollbar-track-piece:vertical:end:double-button,
.single::-webkit-scrollbar-track-piece:vertical:end,
.double-end::-webkit-scrollbar-track-piece:vertical:end,
.double-both::-webkit-scrollbar-track-piece:vertical:end {
    margin-bottom: -6px;
}

::-webkit-scrollbar-track:vertical:disabled {
    -webkit-border-image: url(resources/vertical-track-disabled.png) 13 0 13 0;
    border-color: transparent;
    border-width: 13px 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:vertical:decrement {
    -webkit-border-image: url(resources/vertical-track.png) 13 0 13 0;
    border-color: transparent;
    border-width: 13px 0 0 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:vertical:decrement:hover {
    -webkit-border-image: url(resources/vertical-track-hover.png) 13 0 13 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:vertical:decrement:active {
    -webkit-border-image: url(resources/vertical-track-active.png) 13 0 13 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:vertical:increment {
    -webkit-border-image: url(resources/vertical-track.png) 13 0 13 0;
    border-color: transparent;
    border-width: 0 0 13px 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:vertical:increment:hover {
    -webkit-border-image: url(resources/vertical-track-hover.png) 13 0 13 0;
    border-style: solid;
}

::-webkit-scrollbar-track-piece:vertical:increment:active {
    -webkit-border-image: url(resources/vertical-track-active.png) 13 0 13 0;
    border-style: solid;
}

::-webkit-scrollbar-button:vertical {
    height: 20px;
    -webkit-border-image: url(resources/vertical-button.png) 2 0 2 0;
    border-color: transparent;
    border-width: 2px 0;
    border-style: solid;
}

::-webkit-scrollbar-button:vertical:decrement {
    background-image: url(resources/vertical-decrement-arrow.png), url(resources/vertical-button-background.png);
    background-repeat: no-repeat, repeat-y;
    background-position: 3px 3px, 0 0;
}

::-webkit-scrollbar-button:vertical:decrement:hover {
    -webkit-border-image: url(resources/vertical-button-hover.png) 2 0 2 0;
    background-image: url(resources/vertical-decrement-arrow.png), url(resources/vertical-button-background-hover.png);
    border-style: solid;
}

::-webkit-scrollbar-button:vertical:decrement:active {
    -webkit-border-image: url(resources/vertical-button-active.png) 2 0 2 0;
    background-image: url(resources/vertical-decrement-arrow.png), url(resources/vertical-button-background-active.png);
    border-style: solid;
}

::-webkit-scrollbar-button:vertical:decrement:window-inactive {
    -webkit-border-image: url(resources/vertical-button-inactive.png) 2 0 2 0;
    background-image: url(resources/vertical-decrement-arrow.png), url(resources/vertical-button-background-inactive.png);
    border-style: solid;
}

::-webkit-scrollbar-button:vertical:increment {
    background-image: url(resources/vertical-increment-arrow.png), url(resources/vertical-button-background.png);
    background-repeat: no-repeat, repeat-y;
    background-position: 3px 8px, 0 0;
}

::-webkit-scrollbar-button:vertical:increment:hover {
    -webkit-border-image: url(resources/vertical-button-hover.png) 2 0 2 0;
    background-image: url(resources/vertical-increment-arrow.png), url(resources/vertical-button-background-hover.png);
    border-style: solid;
}

::-webkit-scrollbar-button:vertical:increment:active {
    -webkit-border-image: url(resources/vertical-button-active.png) 2 0 2 0;
    background-image: url(resources/vertical-increment-arrow.png), url(resources/vertical-button-background-active.png);
    border-style: solid;
}

::-webkit-scrollbar-button:vertical:increment:window-inactive {
    -webkit-border-image: url(resources/vertical-button-inactive.png) 2 0 2 0;
    background-image: url(resources/vertical-increment-arrow.png), url(resources/vertical-button-background-inactive.png);
    border-style: solid;
}

:not(.single)::-webkit-scrollbar-button:double-button:vertical:start:decrement,
.double-start::-webkit-scrollbar-button:vertical:start:decrement,
.double-both::-webkit-scrollbar-button:vertical:start:decrement {
    height: 14px;
    border-bottom-width: 0;
    background-position: 3px 3px, 0 0;
}

:not(.single)::-webkit-scrollbar-button:double-button:vertical:start:increment,
.double-start::-webkit-scrollbar-button:vertical:start:increment,
.double-both::-webkit-scrollbar-button:vertical:start:increment {
    background-position: 3px 4px, 0 0;
}

:not(.single)::-webkit-scrollbar-button:double-button:vertical:end:decrement,
.double-end::-webkit-scrollbar-button:vertical:end:decrement,
.double-both::-webkit-scrollbar-button:vertical:end:decrement {
    background-position: 3px 8px, 0 0;
}

:not(.single)::-webkit-scrollbar-button:double-button:vertical:end:increment,
.double-end::-webkit-scrollbar-button:vertical:end:increment,
.double-both::-webkit-scrollbar-button:vertical:end:increment {
    height: 14px;
    border-top-width: 0;
    background-position: 3px 4px, 0 0;
}

::-webkit-scrollbar-button:vertical:end:increment:corner-present {
    border-bottom-width: 0;
    height: 19px;
}

:not(.single)::-webkit-scrollbar-button:double-button:vertical:end:increment:corner-present,
.double-end::-webkit-scrollbar-button:vertical:end:increment:corner-present,
.double-both::-webkit-scrollbar-button:vertical:end:increment:corner-present {
    height: 13px;
}

/* Forced Scrollbar Mode Styles */

.single::-webkit-scrollbar-button:start:decrement,
.single::-webkit-scrollbar-button:end:increment {
    display: block;
}

.single::-webkit-scrollbar-button:start:increment,
.single::-webkit-scrollbar-button:end:decrement {
    display: none;
}

.double-end::-webkit-scrollbar-button:start {
    display: none;
}

.double-end::-webkit-scrollbar-button:end {
    display: block;
}

.double-start::-webkit-scrollbar-button:start {
    display: block;
}

.double-start::-webkit-scrollbar-button:end {
    display: none;
}

.double-both::-webkit-scrollbar-button {
    display: block;
}

.none::-webkit-scrollbar-button {
    display: none;
}
</style>
<script>
/* Preload the scrollbar images to prevent flickering when changing states. */
(new Image()).src = "resources/corner-inactive.png";
(new Image()).src = "resources/corner.png";
(new Image()).src = "resources/horizontal-button-active.png";
(new Image()).src = "resources/horizontal-button-background-active.png";
(new Image()).src = "resources/horizontal-button-background-hover.png";
(new Image()).src = "resources/horizontal-button-background-inactive.png";
(new Image()).src = "resources/horizontal-button-background.png";
(new Image()).src = "resources/horizontal-button-hover.png";
(new Image()).src = "resources/horizontal-button-inactive.png";
(new Image()).src = "resources/horizontal-button.png";
(new Image()).src = "resources/horizontal-decrement-arrow.png";
(new Image()).src = "resources/horizontal-increment-arrow.png";
(new Image()).src = "resources/horizontal-thumb-active.png";
(new Image()).src = "resources/horizontal-thumb-hover.png";
(new Image()).src = "resources/horizontal-thumb-inactive.png";
(new Image()).src = "resources/horizontal-thumb.png";
(new Image()).src = "resources/horizontal-track-active.png";
(new Image()).src = "resources/horizontal-track-disabled.png";
(new Image()).src = "resources/horizontal-track-hover.png";
(new Image()).src = "resources/horizontal-track.png";
(new Image()).src = "resources/resizer-inactive.png";
(new Image()).src = "resources/resizer.png";
(new Image()).src = "resources/vertical-button-active.png";
(new Image()).src = "resources/vertical-button-background-active.png";
(new Image()).src = "resources/vertical-button-background-hover.png";
(new Image()).src = "resources/vertical-button-background-inactive.png";
(new Image()).src = "resources/vertical-button-background.png";
(new Image()).src = "resources/vertical-button-hover.png";
(new Image()).src = "resources/vertical-button-inactive.png";
(new Image()).src = "resources/vertical-button.png";
(new Image()).src = "resources/vertical-decrement-arrow.png";
(new Image()).src = "resources/vertical-increment-arrow.png";
(new Image()).src = "resources/vertical-thumb-active.png";
(new Image()).src = "resources/vertical-thumb-hover.png";
(new Image()).src = "resources/vertical-thumb-inactive.png";
(new Image()).src = "resources/vertical-thumb.png";
(new Image()).src = "resources/vertical-track-active.png";
(new Image()).src = "resources/vertical-track-disabled.png";
(new Image()).src = "resources/vertical-track-hover.png";
(new Image()).src = "resources/vertical-track.png";
</script>
</head>
<body>
<select size=4 >
<option>One
<option>Two
<option>Three
<option>Four
<option>Five
</select>

<select size=4  class="single">
<option>One
<option>Two
<option>Three
<option>Four
<option>Five
</select>

<select size=4  class="double-end">
<option>One
<option>Two
<option>Three
<option>Four
<option>Five
</select>

<select size=4  class="double-start">
<option>One
<option>Two
<option>Three
<option>Four
<option>Five
</select>

<select size=4  class="double-both">
<option>One
<option>Two
<option>Three
<option>Four
<option>Five
</select>

<select size=4  class="none">
<option>One
<option>Two
<option>Three
<option>Four
<option>Five
</select>

<select size=4>
<option>One
<option>Two
</select>