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Web Development — HTML and CSS

Core tags, properties, and concepts for front-end development

D
div_and_span 15 terms Mar 6, 2026
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Terms 15

1
DOCTYPE
Declaration at top of HTML file telling browser which HTML version is used
2
div
Block-level container element with no semantic meaning
3
span
Inline container element with no semantic meaning
4
semantic HTML
Tags that convey meaning: header, nav, main, article, footer, section
5
CSS Specificity
Rule determining which CSS styles take precedence; inline > id > class > tag
6
Box Model
Every element is a box: content, padding, border, margin
7
Flexbox
CSS layout model for distributing space along a single axis
8
CSS Grid
Two-dimensional CSS layout system with rows and columns
9
Media Query
CSS rule applying styles based on device width for responsive design
10
z-index
Controls stacking order of overlapping elements; higher = in front
11
position: absolute
Element removed from flow; positioned relative to nearest positioned ancestor
12
position: relative
Element positioned relative to its normal position; stays in flow
13
CSS Variable
Custom property defined with -- prefix; reusable throughout stylesheet
14
alt attribute
Text alternative for images; critical for accessibility and SEO
15
Viewport
Visible area of a web page on a user's device