Which of the following is the correct way to specify that a block element should occupy 4 columns of the Bootstrap grid when viewed on a typical smart phone?

Question

BlackTom AI · Accepted Answer

Bootstrap's grid system uses a 12-column layout; to make an element occupy 4 columns on a phone you use the phone breakpoint class col-xs-4. 1) Relevant knowledge points and concepts - Bootstrap (v3) grid is based on 12 columns. Classes follow the pattern col--. - Breakpoints: xs = extra small (phones), sm = small (tablets), md = medium (desktops), lg = large (larger desktops). - To target phones specifically, use the xs breakpoint. To occupy 4 of 12 columns, use 4 as the column count. 2) Step-by-step reasoning - Determine how many columns you want: 4. - Determine which breakpoint targets typical smartphones: xs. - Combine them into the Bootstrap class syntax: col-xs-4. - Example usage:

content

3) Intermediate calculation - Fraction of width = 4 columns / 12 total columns = 4/12 = 1/3. - Percentage width = (1/3) × 100% ≈ 33.33%. So col-xs-4 yields about one-third width on xs screens. 4) Why the correct answer is correct - col-xs-4 explicitly tells Bootstrap’s grid to allocate 4 of the 12 columns at the extra-small (phone) breakpoint, which is exactly the requirement. 5) Why the other options are incorrect - class="col-size-4": not a Bootstrap class; "size" is not a defined breakpoint. - class="col-phone-4": not valid syntax; Bootstrap uses xs/sm/md/lg, not "phone". - class="col-4": in Bootstrap 3 this is not a valid breakpoint-specific class (Bootstrap 4 introduced col-4 as shorthand for all breakpoints). The question targets phones (xs), so col-xs-4 is the appropriate Bootstrap 3 form. 6) Conclusion The correct choice is class="col-xs-4", which matches the provided answer.

Which of the following is the correct way to specify that a block element should occupy 4 columns of the Bootstrap grid when viewed on a typical smart phone?单项选择题

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