Issue 36299: Item Qty Goes Negative When Using The Down Arrow Keyboard Key

Author: Roger

app/code/Magento/Checkout/view/frontend/templates/cart/item/default.phtml

@@ -104,6 +104,7 @@ $canApplyMsrp = $helper->isShowBeforeOrderConfirm($product) && $helper->isMinima
                                data-cart-item-id="<?= $block->escapeHtmlAttr($_item->getSku()) ?>"
                                value="<?= $block->escapeHtmlAttr($block->getQty()) ?>"
                                type="number"
+                               min="0"
                                size="4"
                                step="any"
                                title="<?= $block->escapeHtmlAttr(__('Qty')) ?>"

app/code/Magento/Checkout/view/frontend/web/template/minicart/item/default.html

@@ -81,8 +81,9 @@
                            'data-cart-item-id': product_sku
                            }, value: qty"
                            type="number"
+                           min="0"
                            size="4"
-                           class="item-qty cart-item-qty"/>
+                           class="item-qty cart-item-qty">
                 <button data-bind="attr: {
                            id: 'update-cart-item-'+item_id,
                            'data-cart-item': item_id,