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Setting <input type=file>.files #6617

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merged 2 commits into from Aug 2, 2017
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25 changes: 24 additions & 1 deletion html/semantics/forms/the-input-element/files.html
Expand Up @@ -31,9 +31,14 @@

types.forEach(function(type) {
test(function() {
var input = document.createElement("input");
const input = document.createElement("input"),
input2 = document.createElement("input");
input.type = type;
input2.type = "file";
assert_equals(input.files, null, "files should be null");

input.files = input2.files;
assert_equals(input.files, null, "files should remain null as it cannot be set when it does not apply");
}, "files for input type=" + type);
});

Expand All @@ -45,4 +50,22 @@
var files = input.files;
assert_equals(input.files, files, "files should return the same object");
}, "files for input type=file");

test(() => {
const i1 = document.createElement("input"),
i2 = document.createElement("input");
i1.type = "file";
i2.type = "file";

const files = i2.files;
i1.files = i2.files;
assert_equals(i1.files, files, "FileList should not be copied");
assert_equals(i2.files, files, "FileList can be shared across input elements");

i1.files = null;
assert_equals(i1.files, files, "files cannot be set to null");

assert_throws(new TypeError(), () => i1.files = [], "files cannot be set to an array");
assert_throws(new TypeError(), () => i1.files = [new File([], "x")], "files cannot be set to an array (even when it contains File objects)");
}, "setting <input type=file>.files");
</script>