Bootstrap 4 - A Quick Review


Bootstrap 4
·         Bootrap is now officially sass-first project.
·         FlexBox for responsiveness, Traditionally Bootstrap’s layout has been powered by float-based styles
·         Besides Bootstrap’s move away from float-based layouts, its responsiveness now also comes with an extra tier. From now on, you’ll be able to customise these five defaults:
$grid-breakpoints: (
xs: 0px,
sm: 576px,
md: 768px,
lg: 992px,
xl: 1200px /*New Tier Added*/
) !default;
·         The default web fonts (Helvetica Neue, Helvetica, and Arial) have been dropped in Bootstrap 4 and replaced with a “native font stack” for optimum text rendering on every device and OS
$font-family-sans-serif:
  // Safari for OS X and iOS (San Francisco)
  -apple-system,
  // Chrome < 56 for OS X (San Francisco)
  BlinkMacSystemFont,
  // Windows
  "Segoe UI",
  // Android
  "Roboto",
  // Basic web fallback
  "Helvetica Neue", Arial, sans-serif,
  // Emoji fonts
  "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol" !default;

This font-family is applied to the <body> and automatically inherited globally throughout Bootstrap. To switch the global font-family, update $font-family-base and recompile Bootstrap

·         Bootstrap 4 guidelines and reasons for choosing what to override in Reboot:
    • Update some browser default values to use rems instead of ems for scalable component spacing.
    • Avoid margin-top. Vertical margins can collapse, yielding unexpected results. More importantly though, a single direction of margin is a simpler mental model.
    • For easier scaling across device sizes, block elements should use rems for margins.
    • Keep declarations of font-related properties to a minimum, using inherit whenever possible.

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