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Hover

As explained in CSS in Depth, Second Edition

Hover is the pointer-over state represented by the CSS :hover pseudo-class.

Hover is the pointer-over state represented by the CSS :hover pseudo-class. Use it to provide immediate visual feedback when a pointer rests over an interactive element, such as changing a navigation link’s color. section 16.2

Apply hover as part of a larger interaction pattern:

  • Target the element with :hover, as in .nav-links > li > a:hover. section 16.2
  • Change a visible property, such as the link color changing to an accent yellow. section 16.2
  • Combine hover with transition when the change should unfold over time rather than occur abruptly. section 16.2
  • Account for keyboard users with :focus-within when styling a larger interactive navigation region. section 16.2
  • Order link-state rules as link, visited, hover, active when equal specificity is used; later declarations override earlier ones. section 1.1.4

Reveal and emphasize a navigation menu

A compact navigation can remain visually quiet until interaction begins. On small screens, style each link directly: .nav-links > li > a:hover { color: var(--accent-yellow); }. On larger screens, place the menu at the left edge and transition its background: .main-nav { background-color: transparent; transition: background-color 0.5s linear; } .main-nav:hover, .main-nav:focus-within { background-color: rgb(0 0 0 / 0.6); }. This uses hover for pointer feedback while preserving a related focus state for keyboard navigation. section 16.2

Figure 16.5 The menu icons on the left will feature several transforms and transitions.
figure

Use the figure to see the navigation menu’s intended interaction: vertically docked icons whose labels and surrounding treatment respond to interaction. section 16.2

How CSS in Depth, Second Edition covers it

How deep it goes
Explains selector behavior, cascade order, transitions, and focus-related interaction, but stops short of browser event internals.
Examples
Demonstrates link-color feedback and a responsive navigation background that changes on hover or focus-within.
What it assumes
Assumes basic CSS selectors and declarations while reinforcing cascade order, specificity, and link-state rules.
What you can do after
Apply it via CSS to style pointer-over links and coordinate interactive navigation with transitions and focus-within.
How it connects
Connects hover with CSS pseudo-classes, the cascade, specificity, source order, transitions, transforms, and focus-within.

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This explainer was generated by Manning's knowledge graph from the text of CSS in Depth, Second Edition. The section links point to the parts of the book it draws on.