HTML tags : heading, paragraph, anchor, address, list, image, video, audio, iframe, quotations, abbreviation
div, span, semantic tag, header, footer, main, section, nav, aside, article, em, i, strong, b, mark, table, tr, th, td, thead, tbody, tfoot, Etc
Form, input type, text, email, password, number, url, file, date, range, color, submit, radio, checkbox, label, select, option, textarea, button
CSS Cascading Style Sheet, CSS Syntax, selector(tag, id, class, attribute, pseudo-class, universal, combination), property value, How to add CSS
css properties, property values
Box model, box sizing, content-box, border-box, Box type, block, inline, inline-block
float, clearfix, pseudo-element
Flexbox, flex-direction, main-axis, cross-axis, justify-content, align items, order, flex-grow, flex-shrink, align-self
Media Query
event flow, currentTarget, target, capture phase, bubble phase
img attribute(width,height), font-family("font name"), text-indent, , selector precedence
position, static, relative, absolute, fixed, sticky