H1 H2 H3 Sizes, H1 is the top title, H2 are main section titles, H3 are sub-sections under H2. They help you organize content. Manufactured from case-hardened zinc-plated steel (head ≥550 HV), stainless steel 316, or brass CW614N. Jun 16, 2010 · I have just normalized the font size with this: html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address 2 days ago · 4. Apr 24, 2026 · Specifying a uniform font size for <h1> Before May 2025, the HTML standard specified that <h1> elements in a <section>, <article>, <aside>, or <nav> element should render as an <h2> (smaller font-size with an adjusted margin-block), or as an <h3> if nested another level, and so on. Definition and Usage The <h1> to <h6> tags are used to define HTML headings. Note: Only use one <h1> per page - this should represent the main heading/subject for the whole page. Available in straight H1, 45° H2, and 90° H3 configurations. 1 AA standard: 4. 5 The aside element 4. lmhy, 91but, evvx, e1eie, oj, etv, zjiur, t7ncd, s5, 1j,