Data

• access, designing, 751–753

  • encapsulating via a helper class, 753c

• API server for company, 692c

• architect, 33

• center, 21

  • examples, 21f

• component, 570–572

  • communication between, 572f

  • data flow between, 574f

• compression, 910–911

• content, separation, 713f

• definition statements, 731–732

• duplication, 721

• fetching, 583–584

• flow, 654f

• integrity, 721

• in key/value store, 757f

• members, 643

• relational vs. document store, 758f

• sending, determination, 655–657

• sharing, 571f

• transforming for chart, 537f

• types, 613–614

Database, 712

• connection, 734–736

  • mysqli, usage, 735c

  • PDO, usage, 735c

• design, 712–713

• efficiency, 732–733

• engine, 933

• indexes, 732–733

  • visualization, 733f

• management, 715–720

• normalization, 722

• NoSQL database, 754–760

• role, 712–713

• servers, 18

• sharding, 770, 771f

• software, 70–71

• table

  • data types, 722t

• term, usage, 712

• website usage, 714f

Database administrator (DBA), 33

Database-as-a-Service (DBaaS), 704–705

Database Management System (DBMS), 18, 70

• MySQL, 712

Data Definition Language (DDL), 731

Data Encryption Standard (DES), 837, 837f

Data eviction algorithms, 806

<datalist> element, usage, 207f

Data Manipulation Language, 731

Data replication and synchronization, 769–771

• failover clustering on master, 769, 770f

• multiple master replication, 770, 771f

• problem of, 769

• sharding, 770, 771f

• single master replication, 969, 970f

dataset property, usage, 446, 447f

Date control, 213

• example, 214f

• HTML5 example, 214t

DB2 (IBM), 712

Declaration, 125

• block, 125

Decryption, 835

Dedicated hosting, 898

• disadvantage, 898

Default parameters, 390–391, 630

• JavaScript, 390–391

• PHP, 630

DELETE statement (SQL), 727

• example, 728f

Denial of service, 817

• attacks, 870

  • distributed, 870–871, 870f

  • illustration, 870f

Dependencies, 577

Derived class, 651

Descendants, 80, 139

• selection, syntax, 139f

• selector, 139

Description lists, 100

Design companies, 36–37

Desktop applications

• web applications

  • comparison, 8–9

  • differences, 780f

<details> and <summary> elements, 109, 110f

Device pixels, 256

DevOps (development and operations), 36, 881–888

Diffie-Hellman key exchange, 838–839

dig (command), annotated usage, 891

Digest, 850, 850f

Digital networking, 956–957

Digital signature, 840

• illustration, 841f

Digital subscriber line access multiplexer (DSLAM), 28

Directives, 907

Directory, 95

• requests, handling, 916–917

• web, 944

DirectoryIndex directive, 917

Directory-level configuration files, 907

Directory listings, 917

Display

• hover, usage, 291f

• property, usage, 290f

• resolution, 254–255

  • impact, 256f

• visibility, comparison, 290f

display_error setting, 619

Distributed transaction processing (DTP), 730

• example, 731f

Distributed transactions, 729, 730–731

Dithering, 250f, 251

<div>

• based XHTML layout, 102f

• elements, usage, 94f

DMSs. See Document Management Systems

Docker, 903

Document Management Systems (DMSs), 971

Document Object Model (DOM), 80, 132, 364, 419–427

• changing style, 427–429

• code wrapping within DOMContentLoaded event handler, 439c

• defined, 419

• document object, 420–421

• Element Node object, 424–425, 425t

• empty element, 80

• family relations, 430f, 431

• floating, example, 283f

• floating elements, 283–284

• hiding, 288–291

• manipulation methods, 430, 431t

  • vs. InnerHTML vs textContent, 429

  • methods, 430, 431t

  • virtual vs. real, 547f

• modification, 427–435

  • dynamic creation, 433c

  • element’s style, 427–429

  • visualizing, 432f

• nesting, 553

• NodeLists, 420

• nodes, 420, 420f

• object properties, 421t

• and page loading, 439

• positioning elements, 284–288

• pseudo-element selector, 136–138

• selection methods, 422t, 422–424

• spacing/differentiation, provision, 157f

• tables, usage, 193

• timing, 433

• tree, 419f

• true size, calculation, 161f

• vertical elements, contact, 158

• W3C definition, 148

• working with (example), 453–455

Document Root, 419

Documents, outlines, 87, 133f

• example, 90f

Document stores, NoSQL, 757–759

document.write(), 362, 364

DOM. See Document Object Model (DOM)

Domain Name Administration, 888–894

Domain names, 48, 50

• address resolution process, 55f

• administration, 888–894

• checking, 891

• levels, 51–53

• records, 893

• registrars, 53–54

• registration, 53, 888–890

  • process, 54f

• update, 891

Domain Name System (DNS), 48, 49–57

• overview, 50f

• record types, 891

• reverse DNS

  • lookups, 53

• reverse DNs, 894

• server, 56

• zone file, 891

Domains, 58. See also Uniform Resource Locator

• levels, 52f

• subdomains, 53

Domain-Validated (DV) Certificates, 843–844

Doorway pages, 952

Dot notation, 367

do-while loop

• JavaScript, 373

• PHP, 639c

Drupal, 972t

Dynamic ads, 993

Dynamically typed variables, 359, 613

Dynamic websites, 11

• example, 12f

• static websites, 10