<article> Defines independent, self-contained content
<aside> Defines content aside from the page content
<details> Defines additional details that the user can view or hide
<figcaption> Defines a caption for a <figure> element
<figure> Specifies self-contained content, like illustrations, diagrams, photos, code listings, etc.
<footer> Defines a footer for a document or section
<header> Specifies a header for a document or section
<main> Specifies the main content of a document
<mark> Defines marked/highlighted text
<nav> Defines navigation links
<section> Defines a section in a document
<summary> Defines a visible heading for a <details> element
<time> Defines a date/time # Is it a meaningful area of the page?
Use an HTML5 block element like <header> or <footer>.
# Does it label the start of a new section?
Use a heading (with the right level) like <h2> or <h3>
# Does it navigate to a new page?
Use an <a href="/page">
# Does it trigger JS behaviour?
Use a <button>
# Does it allow user input?
Use a <form> containing <input>s (with <label>s!)
# Is it just for applying some layout/styles?
Use something like <div class="grid"> or <span class="big-text">
<span style="font-size: 32px; margin: 21px 0;">Is this a top level heading?</span>