Have 2 spans with full and short strings, then when below target resolution, swap between them using a media query:
HTML
<span class="full-text">Saturday</span>
<span class="short-text">Sat</span>
CSS
// Hide short text by default (resolution > 1200px)
.short-text { display: none; }
// When resolution <= 1200px, hide full text and show short text
@media (max-width: 1200px) {
.short-text { display: inline-block; }
.full-text { display: none; }
}
Replace 1200px with your target resolution breakpoint.
More on CSS media queries
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