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diff --git a/testing/web-platform/tests/webnn/validation_tests/where.https.any.js b/testing/web-platform/tests/webnn/validation_tests/where.https.any.js
new file mode 100644
index 0000000000..a26fa24931
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+++ b/testing/web-platform/tests/webnn/validation_tests/where.https.any.js
@@ -0,0 +1,129 @@
+// META: title=validation tests for WebNN API where operation
+// META: global=window,dedicatedworker
+// META: script=../resources/utils_validation.js
+
+'use strict';
+
+const kExampleConditionDescriptor = {
+  dataType: 'uint8',
+  dimensions: [2, 4]
+};
+const kExampleInputDescriptor = {
+  dataType: 'float32',
+  dimensions: [2, 4]
+};
+
+const tests = [
+  {
+    name:
+        '[where] Throw if the condition data type is not uint8.',
+    condition: {dataType: 'float32', dimensions: [2, 4]},
+    input: {dataType: 'float32', dimensions: [2, 4]},
+    other: {dataType: 'float32', dimensions: [2, 4]},
+  },
+  {
+    name:
+        '[where] Throw if the data types of input and other do not match',
+    condition: {dataType: 'uint8', dimensions: [2, 4]},
+    input: {dataType: 'float16', dimensions: [2, 4]},
+    other: {dataType: 'float32', dimensions: [2, 4]},
+  },
+  {
+    name:
+        '[where] Throw if the shapes of input and other are not broadcastable',
+    condition: {dataType: 'uint8', dimensions: [2, 4]},
+    input: {dataType: 'float32', dimensions: [2, 4]},
+    other: {dataType: 'float32', dimensions: [2, 3]},
+  },
+  {
+    name:
+        '[where] Throw if the condition shape is not broadcastable',
+    condition: {dataType: 'uint8', dimensions: [2, 4]},
+    input: {dataType: 'float32', dimensions: [2, 3]},
+    other: {dataType: 'float32', dimensions: [2, 1]},
+  },
+  {
+    name:
+        '[where] Test building where with 2-D condition, 2-D input and 2-D other using broadcast',
+    condition: {dataType: 'uint8', dimensions: [2, 1]},
+    input: {dataType: 'float32', dimensions: [2, 4]},
+    other: {dataType: 'float32', dimensions: [2, 4]},
+    output: {dataType: 'float32', dimensions: [2, 4]},
+  },
+  {
+    name:
+        '[where] Test building where with 2-D condition, 2-D input and 3-D other using broadcast',
+    condition: {dataType: 'uint8', dimensions: [1, 4]},
+    input: {dataType: 'float32', dimensions: [3, 4]},
+    other: {dataType: 'float32', dimensions: [2, 3, 4]},
+    output: {dataType: 'float32', dimensions: [2, 3, 4]},
+  },
+  {
+    name:
+        '[where] Test building where with 3-D condition, 3-D input and 2-D other using broadcast',
+    condition: {dataType: 'uint8', dimensions: [2, 1, 4]},
+    input: {dataType: 'float32', dimensions: [2, 3, 4]},
+    other: {dataType: 'float32', dimensions: [1, 4]},
+    output: {dataType: 'float32', dimensions: [2, 3, 4]},
+  },
+  {
+    name:
+        '[where] Test building where with 4-D condition, 3-D input and 2-D other using broadcast',
+    condition: {dataType: 'uint8', dimensions: [2, 3, 4, 5]},
+    input: {dataType: 'float32', dimensions: [3, 4, 5]},
+    other: {dataType: 'float32', dimensions: [4, 5]},
+    output: {dataType: 'float32', dimensions: [2, 3, 4, 5]},
+  }
+];
+
+tests.forEach(
+    test => promise_test(async t => {
+      const condition = builder.input('condition', {
+        dataType: test.condition.dataType,
+        dimensions: test.condition.dimensions
+      });
+      const input = builder.input(
+          'input',
+          {dataType: test.input.dataType, dimensions: test.input.dimensions});
+      const other = builder.input(
+          'other',
+          {dataType: test.other.dataType, dimensions: test.other.dimensions});
+      if (test.output) {
+        const output = builder.where(condition, input, other);
+        assert_equals(output.dataType(), test.output.dataType);
+        assert_array_equals(output.shape(), test.output.dimensions);
+      } else {
+        assert_throws_js(
+            TypeError, () => builder.where(condition, input, other));
+      }
+    }, test.name));
+
+multi_builder_test(async (t, builder, otherBuilder) => {
+  const conditionFromOtherBuilder =
+      otherBuilder.input('condition', kExampleConditionDescriptor);
+
+  const input = builder.input('input', kExampleInputDescriptor);
+  const other = builder.input('other', kExampleInputDescriptor);
+  assert_throws_js(
+      TypeError, () => builder.where(conditionFromOtherBuilder, input, other));
+}, '[where] throw if condition is from another builder');
+
+multi_builder_test(async (t, builder, otherBuilder) => {
+  const inputFromOtherBuilder =
+      otherBuilder.input('input', kExampleInputDescriptor);
+
+  const condition = builder.input('condition', kExampleConditionDescriptor);
+  const other = builder.input('other', kExampleInputDescriptor);
+  assert_throws_js(
+      TypeError, () => builder.where(condition, inputFromOtherBuilder, other));
+}, '[where] throw if input is from another builder');
+
+multi_builder_test(async (t, builder, otherBuilder) => {
+  const otherFromOtherBuilder =
+      otherBuilder.input('other', kExampleInputDescriptor);
+
+  const condition = builder.input('condition', kExampleConditionDescriptor);
+  const input = builder.input('input', kExampleInputDescriptor);
+  assert_throws_js(
+      TypeError, () => builder.where(condition, input, otherFromOtherBuilder));
+}, '[where] throw if other is from another builder');