Update md/t1.md, md/t2.md, public/test.html files

Page-level Place an alert at the top of a page, directly below the navigation bar and above the breadcrumbs, when it refers to something that happened at the page level. For example, an alert that states “Something went wrong while fetching latest comments” on an issue page. Page-level alerts are restricted to the content container width which can be either fixed or fluid, depending on user’s preference.