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Frontend Interview Questions

HTML

Based on the principles of modern web standards, which of the following best describes "Semantic HTML" and its primary importance?

A. It acts as a server-side directive that compiles HTML into binary code for faster execution. B. It refers to using specific HTML markup that reflects the type and meaning of the content (e.g., <article>, <footer>), which is crucial for accessibility and SEO context. C. It is a deprecated method of styling that uses attributes like font-color directly within tags to ensure older browsers can read the text. D. It is a strict validation rule that prevents the page from rendering if tags are not closed properly.

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#!/usr/bin/env bash
# vim:set ft=bash ts=4 sw=4 et :
# shellcheck shell=bash
# shellcheck disable=SC2317

## Usage:
##   docker-etc-hosts-install
##   Installs docker container names and IP addresses in /etc/hosts
##   This script is idempotent
##   Note: Requires root privileges to write to /etc/hosts

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class DeferredPromise extends Promise {

  constructor(def = (res, rej)=>{}) {
    let res, rej;
    super((resolve, reject)=>{
      def(resolve, reject);
      res = resolve;
      rej = reject;
    });
    this.resolve = res;

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#!/usr/bin/env bash

if [ -z "$1" ]
then
        echo "$0 client-name"
        exit 1
fi

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#!/bin/bash

function test {
    MESSAGE=$1
    RECEIVED=$2
    EXPECTED=$3

    if [ "$RECEIVED" = "$EXPECTED" ]; then
        echo -e "\033[32m✔︎ Tested $MESSAGE"
    else

celmaun

This simple line chart is constructed from a TSV file storing the closing value of AAPL stock over the last few years. The chart employs conventional margins and a number of D3 features:

• d3.tsv - load and parse data
• d3.time.format - parse dates
• d3.time.scale - x-position encoding
• d3.scale.linear - y-position encoding
• d3.extent - compute domains
• d3.svg.axis - display axes
• d3.svg.line - display line shape

celmaun

<b>Sallu Rocks!</b>

celmaun

preg_match("/yt\.setConfig\(\{\s+\'PLAYER_CONFIG\'\:\s(?<config>.*?)\s+\}\)/s", $page, $matches);

$config = json_decode($matches['config']);

$fmts = explode(',', $config->args->url_encoded_fmt_stream_map);

foreach( $fmts as $k => $v ) { parse_str($v, $fmts[$k]); }

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preg_match("/yt\.setConfig\(\{\s+\'PLAYER_CONFIG\'\:\s(?<config>.*?)\s+\}\)/s", $page, $matches);

$config = json_decode($matches['config']);

$fmts = explode(',', $config->args->url_encoded_fmt_stream_map);

foreach( $fmts as $k => $v ) { parse_str($v, $fmts[$k]); }

celmaun

<?php

// Quick bug fix for Issue #24837 (http://www.magentocommerce.com/bug-tracking/issue/?issue=10453)

$rootBlock = Mage::app()->getLayout()->getBlock('root');

if ( false !== $rootBlock ) {
    
    foreach ( Mage::getModel('page/config')->getPageLayouts() as $pageLayout ) {