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CSS Grid and Flexbox: two ways to arrange an interface
Flexbox organizes items along one major axis, and Grid manages rows and columns together. The two models can work together in one page.
Published22 Oct 2026
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CSS variables: common values with a clear purpose
Custom properties allow values to be named and reused. Inheritance and cascade determine which value the particular item receives.
Published22 Oct 2026
Technology
Dataclass: less boilerplate without automatic validation
The dataclass decorator can generate initialization and representation methods from declared fields. Type annotations describe those fields but do not themselves check every value at ru...
Published22 Oct 2026
Technology
Datetime: a time without a zone leaves a question open
Python distinguishes datetime objects with time-zone information from those without it. A value such as 12:00 does not by itself identify the same instant for readers in different count...
Published22 Oct 2026
Technology
Decimal: why the starting value matters
Decimal can represent decimal values that binary float cannot represent exactly. After from decimal import Decimal, Decimal('0.1') + Decimal('0.2') produces Decimal('0.3').
Published22 Oct 2026
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details and summary: expandable block with HTML
The <details> element creates a disclosure block, and <summary> provides its visible heading.
Published22 Oct 2026
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dialog: opening as a modal window
showModal() gives a different behavior than the usual display of a dialogue.
Published22 Oct 2026
Technology
Diff-tree: comparing recorded file trees
git diff-tree compares contents and modes in Git trees. With one commit, its usual form compares that commit with its parents.
Published22 Oct 2026
Technology
Difflib: showing differences between sequences
difflib compares sequences and can produce readable changes, including a unified diff. This helps review two versions of a text file.
Published22 Oct 2026
Technology
direction and HTML dir: which describes the direction of the text
The language direction is also part of the meaning of the document.
Published22 Oct 2026
Technology
display: contents removes the box, not the HTML element
Children can participate in the arrangement without their own box on the wrapper.
Published22 Oct 2026
Technology
DNS: how a site's name leads to its server
DNS connects domains with information about network services. Various records, authoritative servers, and caches explain why the change of hosting is not visible to all visitors at the...
Published22 Oct 2026