<!DOCTYPE html>
<html>
<head>
<title>CSSPageRule interface</title>
<link href="mailto:cdumez@apple.com" rel="author" title="Chris Dumez">
<link href="https://drafts.csswg.org/cssom/#the-csspagerule-interface" rel="help">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id="styleElement">
    @page :left {
        margin-left: 3cm;
        margin-right: 4cm;
    }
</style>
</head>
<body>
<script>
    var rule;
    setup(function() {
        var styleSheet = document.getElementById("styleElement").sheet;
        var ruleList = styleSheet.cssRules;
        rule = ruleList[0];
    });

    test(function() {
        assert_true(rule instanceof CSSRule);
        assert_true(rule instanceof CSSPageRule);
    }, "CSSRule and CSSPageRule types");

    test(function() {
        assert_true(rule instanceof CSSRule);
        assert_idl_attribute(rule, "cssText");
        assert_idl_attribute(rule, "parentRule");
        assert_idl_attribute(rule, "parentStyleSheet");
    }, "Existence of CSSRule attributes");

    test(function() {
        assert_readonly(rule, "type");
        assert_readonly(rule, "parentRule");
        assert_readonly(rule, "parentStyleSheet");
    }, "Writability of CSSRule attributes");

    test(function() {
        assert_equals(rule.type, rule.PAGE_RULE);
        assert_equals(typeof rule.cssText, "string");
        assert_equals(rule.cssText, "@page :left { margin-left: 3cm; margin-right: 4cm; }");
        assert_equals(rule.parentRule, null);
        assert_true(rule.parentStyleSheet instanceof CSSStyleSheet);
    }, "Values of CSSRule attributes");

    test(function() {
        assert_idl_attribute(rule, "selectorText");
        assert_equals(typeof rule.selectorText, "string");
        assert_idl_attribute(rule, "style");
    }, "Existence and type of CSSPageRule attributes");

    test(function() {
        assert_equals(rule.selectorText, "@page :left");
        assert_true(rule.style instanceof CSSStyleDeclaration);
    }, "Values of CSSPageRule attributes");

    test(function() {
        assert_equals(rule.style.marginLeft, "3cm", "marginLeft");
        assert_equals(rule.style.marginRight, "4cm", "marginRight");

        rule.style.marginLeft = "5px";
        rule.style.marginRight = "6px";

        assert_equals(rule.style.marginLeft, "5px");
        assert_equals(rule.style.marginRight, "6px");
    }, "Mutability of CSSPageRule's style attribute");

    test(function() {
        rule.style = "margin-left: 6cm; margin-right: 8cm;";

        assert_equals(rule.style.marginLeft, "6cm", "marginLeft");
        assert_equals(rule.style.marginRight, "8cm", "marginRight");
    }, "CSSPageRule's style has [PutForwards]");
</script>
</body>
</html>