html / css

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