Vendor things

third-party/vendor/web-sys/tests/wasm/image_data.rs

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+use wasm_bindgen::prelude::*;
+use wasm_bindgen::Clamped;
+use wasm_bindgen_test::*;
+use web_sys::HtmlAnchorElement;
+#[wasm_bindgen(module = "/tests/wasm/element.js")]
+extern "C" {
+    fn new_a() -> HtmlAnchorElement;
+}
+
+#[wasm_bindgen_test]
+fn test_anchor_element() {
+    // This test is to make sure there is no weird mutability going on.
+    let buf = vec![1, 2, 3, 255];
+    let image_data = web_sys::ImageData::new_with_u8_clamped_array(Clamped(&buf), 1).unwrap();
+    let mut data = image_data.data();
+    data[1] = 4;
+    assert_eq!(buf[1], 2);
+}