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<!DOCTYPE html>
<title>Tests that the parameters to document.elementFromPoint() and
document.elementsFromPoint() are mandatory and of type double.</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#extensions-to-the-document-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function validate_function_parameter_count(testFunc, funcName) {
test(function() {
assert_throws_js(TypeError, function() {
testFunc();
}, "Called with no parameter");
assert_throws_js(TypeError, function() {
testFunc(0);
}, "Called with 1 parameter");
}, funcName + ": Parameters are mandatory.");
}
function validate_function_parameter_type(testFunc, funcName) {
test(function() {
assert_throws_js(TypeError, function() {
testFunc(0, Infinity);
}, "Passing Infinity as second parameter throws");
assert_throws_js(TypeError, function() {
testFunc(Infinity, 0);
}, "Passing Infinity as first parameter throws");
assert_throws_js(TypeError, function() {
testFunc(0, NaN);
}, "Passing NaN as second parameter throws");
assert_throws_js(TypeError, function() {
testFunc(NaN, 0);
}, "Passing NaN as first parameter throws");
}, funcName + ": Parameters should be finite floating point values.");
}
validate_function_parameter_count(function(x, y) {
document.elementFromPoint(x, y);
}, "document.elementFromPoint");
validate_function_parameter_type(function(x, y) {
document.elementFromPoint(x, y);
}, "document.elementFromPoint");
validate_function_parameter_count(function(x, y) {
document.elementsFromPoint(x, y);
}, "document.elementsFromPoint");
validate_function_parameter_type(function(x, y) {
document.elementsFromPoint(x, y);
}, "document.elementsFromPoint");
</script>
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