René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Font fallback bugs","articleBody":"### Bug summary\n\nIf the global font size is set with plt.rcParams[\"font.size\"] and the size value \u003e12, the Chinese charaters will show, else the Chinese characteres will disappear.\n\n\n\n\n### Code for reproduction\n\n```Python\nimport numpy as np\nimport matplotlib.pyplot as plt\n\nplt.rcParams[\"font.family\"] = [\"Times New Roman\", \"SimSun\"]\nplt.rcParams[\"font.serif\"] = [\"Times New Roman\", \"SimSun\"]\nplt.rcParams[\"font.sans-serif\"] = [\"Times New Roman\", \"SimSun\", \"Arial\", \"SimHei\"]\n\nplt.rcParams[\"mathtext.fontset\"] = \"custom\"\nplt.rcParams[\"axes.unicode_minus\"] = False\nplt.rcParams[\"font.size\"] = 13  # If font size \u003c= 12, the Chinese characters will not show.\n\nx = np.array([1, 2, 3, 4, 5])\ny = np.array([1, 4, 9, 16, 25])\n\nplt.plot(x, y)\nplt.xlabel('X-axis / X 轴')\nplt.ylabel('Y-axis / Y 轴')\nplt.title('Font Style Example / 字体样式示例')\nplt.show()\n```\n\n### Actual outcome\n\n\"# plt.rcParams[\"font.size\"] = 13\" \n\n\u003cimg width=\"639\" height=\"558\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/a83eec59-8d29-47d7-b028-1374a4776676\" /\u003e\n\n\n\"plt.rcParams[\"font.size\"] = 13\" \n\u003cimg width=\"836\" height=\"848\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/43a1ac15-1ace-4da3-9f89-83579bee860b\" /\u003e\n\n### Expected outcome\n\nFont fallback can work correctly. The text containing Chinese characters and Non-Chinese characters can be diplayed with SimSun font and Time New Roman font, respectively.\n\n### Additional information\n\nFont fallback is incompatible for SimSun and Times New Roman fonts.\n\n### Operating system\n\nWindows\n\n### Matplotlib Version\n\n3.11.0\n\n### Matplotlib Backend\n\ntkagg\n\n### Python version\n\n3.14.6\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nuv","author":{"url":"https://github.com/dragoneptech","@type":"Person","name":"dragoneptech"},"datePublished":"2026-07-18T10:23:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/32063/matplotlib/issues/32063"}