+| HTTP header | Quick definition | Agent |
|---|
+| Accept | media types handled by client | Client |
+| Accept-Charset | charsets understood by client | Client |
+| Accept-Encoding | encodings understood by client | Client |
+| Accept-Language | languages understood by client (or ideally by user) | Client |
+| Accept-Ranges | whether server understands range requests (and what type) | Server |
+| Age | how long the content has been cached | Cache |
+| Allow | methods supported for that URL | Server |
+| Authorization | HTTP authentication user name and password | Client |
+| Cache-Control | various sub-fields indicating if the file can be cached | Server |
+| Connection | To distinguish persistent and close-able connections | Client, Server |
+| Content-Encoding | Encodings used - for example gzip compression | Server |
+| Content-Language | Language of page | Server |
+| Content-Length | Size of what is being sent from server or POSTed by UA | Client, Server |
+| Content-Location | The "real" URL of a page | Server |
+| Content-MD5 | MD5 hash for integrity check of the entity-body | Client, Server |
+| Content-Range | What part of the document is being sent | Server |
+| Content-Type | What type of file is sent | Server |
+| Date | Current date | Server |
+| ETag | Short "signature" of that version of a file, can be used to check if it is updated | Server |
+| Expect | Client asks for specific server behaviour | Client |
+| Expires | how long the content may be cached | Server |
+| From | E-mail of user visiting site (anyone actually using this??) | Client |
+| Host | Domain name of server one is requesting page from | Client |
+| If-Match | If page still matches previously received ETag "signature" | Client |
+| If-Modified-Since | If page has been changed since a certain date | Client |
+| If-None-Match | If page does not match previously received ETag "signature" | Client |
+| If-Range | Request only part of a file if it isn't updated | Client |
+| If-Unmodified-Since | If page hasn't been changed since a certain date | Client |
+| Last-Modified | Date of last time the file was changed | Server |
+| Location | Send the request to another place | Server |
+| Max-Forwards | Limit the number of proxy servers that may process the request | Client |
+| Pragma | General "whatever" tag, like HTML's META | Client, Server, Cache |
+| Proxy-Authenticate | Request proxy user name and password | Proxy |
+| Proxy-Authorization | Send proxy user name and password | Client |
+| Range | Request only part of a file | Client |
+| Referer | URL of page with a link that took you to the current | Client |
+| Retry-After | Used with error messages to indicate when service may be available again | Server |
+| Server | Name of server software | Server |
+| TE | Acceptable transfer-codings | Client |
+| Trailer | Used with transfer-coding to show what HTTP headers are available in "trailer" of message | Server |
+| Transfer-Encoding | Type of transformation used between sender and recipient | Server |
+| Upgrade | Client indicates that it supports other protocols/versions than HTTP/1.1 | Client |
+| User-Agent | Name of UA software | Client |
+| Vary | For content-negotiation, shows criteria used for selecting that content | Server |
+| Via | Proxy servers note that they've been involved in transferring this content | Proxy |
+| Warning | Human- or proxy-readable message about the state of the contents | Server |
+| WWW-Authenticate | Request user name and password | Server |
+
+
+
+A listing of HTML4 Character Entities
+
+
+ | Code |
+ Name |
+ Displays As: |
+
+
+| 	 | Horizontal tab | non-printing |
+| | Line feed | non-printing |
+| | Carriage Return | non-printing |
+| " or " | quotation mark = APL quote | " or " |
+| & or & | ampersand | & or & |
+|   | Space | non-printing |
+| ! | Exclamation mark | ! |
+| " or " | Quotation mark | " or " |
+| # | Number sign | # |
+| $ | Dollar sign | $ |
+| % | Percent sign | % |
+| & or & | Ampersand | & or & |
+| ' | Apostrophe | ' |
+| ( | Left parenthesis | ( |
+| ) | Right parenthesis | ) |
+| * | Asterisk | * |
+| + | Plus sign | + |
+| , | Comma | , |
+| - | Hyphen | - |
+| . | Period (fullstop) | . |
+| / | Solidus (slash) | / |
+| : | Colon | : |
+| ; | Semi-colon | ; |
+| < or < | Less than | < or < |
+| = | Equals sign | = |
+| > or > | Greater than | > or > |
+| ? | Question mark | ? |
+| @ | Commercial at | @ |
+| [ | Left square bracket | [ |
+| \ | Reverse solidus (backslash) | \ |
+| ] | Right square bracket | ] |
+| ^ | Caret | ^ |
+| _ | Horizontal bar (underscore) | _ |
+| ` | Acute accent | ` |
+| { | Left curly brace | { |
+| | | Vertical bar | | |
+| } | Right curly brace | } |
+| ~ | Tilde | ~ |
+| ’ is non-standard! use ’ instead! |
+| &endash; or – are non-standard! use – instead! |
+| &emdash; or — are non-standard! use — instead! |
+|   or | no-break space = non-breaking space | or |
+| ¡ or ¡ | inverted exclamation mark | ¡ or ¡ |
+| ¢ or ¢ | Cent sign | ¢ or ¢ |
+| £ or £ | Pound sterling | £ or £ |
+| ¤ or ¤ | General currency sign | ¤ or ¤ |
+| ¥ or ¥ | yen sign = yuan sign | ¥ or ¥ |
+| ¦ or ¦ | pipe or broken bar = broken vertical bar | ¦ or ¦ |
+
+
+| § or § | Section sign | § or § |
+| ¨ or ¨ | diaeresis = spacing diaeresis | ¨ or ¨ |
+| © or © | copyright sign | © or © |
+| ª or ª | feminine ordinal indicator | ª or ª |
+| « or « | left-pointing double angle quotation mark = left pointing guillemet | « or « |
+| ¬ or ¬ | not sign | ¬ or ¬ |
+| ­ or ­ | soft hyphen = discretionary hyphen | or |
+| ® or ® | registered sign = registered trade mark sign | ® or ® |
+| ¯ or ¯ | macron = spacing macron = overline = APL overbar | ¯ or ¯ |
+| ° or ° | degree sign | ° or ° |
+| ± or ± | plus-minus sign = plus-or-minus sign | ± or ± |
+| ² or ² | superscript two = superscript digit two = squared | ² or ² |
+| ³ or ³ | superscript three = superscript digit three = cubed | ³ or ³ |
+| ´ or ´ | acute accent = spacing acute | ´ or ´ |
+| µ or µ | micro sign | µ or µ |
+| ¶ or ¶ | pilcrow sign = paragraph sign | ¶ or ¶ |
+| · or · | middle dot = Georgian comma = Greek middle dot | · or · |
+| ¸ or ¸ | cedilla = spacing cedilla | ¸ or ¸ |
+| ¹ or ¹ | superscript one = superscript digit one | ¹ or ¹ |
+| º or º | masculine ordinal indicator | º or º |
+| » or » | right-pointing double angle quotation mark = right pointing guillemet | » or » |
+| ¼ or ¼ | vulgar fraction one quarter = fraction one quarter | ¼ or ¼ |
+| ½ or ½ | vulgar fraction one half = fraction one half | ½ or ½ |
+| ¾ or ¾ | vulgar fraction three quarters = fraction three quarters | ¾ or ¾ |
+| ¿ or ¿ | inverted question mark = turned question mark | ¿ or ¿ |
+| À or À | latin capital letter A with grave = latin capital letter A grave | À or À |
+| Á or Á | latin capital letter A with acute | Á or Á |
+|  or  | latin capital letter A with circumflex |  or  |
+| à or à | latin capital letter A with tilde | à or à |
+| Ä or Ä | latin capital letter A with diaeresis | Ä or Ä |
+| Å or Å | latin capital letter A with ring above = latin capital letter A ring | Å or Å |
+| Æ or Æ | latin capital letter AE = latin capital ligature AE | Æ or Æ |
+| Ç or Ç | latin capital letter C with cedilla | Ç or Ç |
+| È or È | latin capital letter E with grave | È or È |
+| É or É | latin capital letter E with acute | É or É |
+| Ê or Ê | latin capital letter E with circumflex | Ê or Ê |
+| Ë or Ë | latin capital letter E with diaeresis | Ë or Ë |
+| Ì or Ì | latin capital letter I with grave | Ì or Ì |
+| Í or Í | latin capital letter I with acute | Í or Í |
+| Î or Î | latin capital letter I with circumflex | Î or Î |
+| Ï or Ï | latin capital letter I with diaeresis | Ï or Ï |
+| Ð or Ð | latin capital letter ETH | Ð or Ð |
+| Ñ or Ñ | latin capital letter N with tilde | Ñ or Ñ |
+| Ò or Ò | latin capital letter O with grave | Ò or Ò |
+| Ó or Ó | latin capital letter O with acute | Ó or Ó |
+| Ô or Ô | latin capital letter O with circumflex | Ô or Ô |
+| Õ or Õ | latin capital letter O with tilde | Õ or Õ |
+| Ö or Ö | latin capital letter O with diaeresis | Ö or Ö |
+| × or × | multiplication sign | × or × |
+| Ø or Ø | latin capital letter O with stroke = latin capital letter O slash | Ø or Ø |
+| Ù or Ù | latin capital letter U with grave | Ù or Ù |
+| Ú or Ú | latin capital letter U with acute | Ú or Ú |
+| Û or Û | latin capital letter U with circumflex | Û or Û |
+| Ü or Ü | latin capital letter U with diaeresis | Ü or Ü |
+| Ý or Ý | latin capital letter Y with acute | Ý or Ý |
+| Þ or Þ | latin capital letter THORN | Þ or Þ |
+| ß or ß | Small sharp s, German (sz ligature) | ß or ß |
+| ß or ß | latin small letter sharp s = ess-zed | ß or ß |
+| à or à | latin small letter a with grave = latin small letter a grave | à or à |
+| á or á | latin small letter a with acute | á or á |
+| â or â | latin small letter a with circumflex | â or â |
+| ã or ã | latin small letter a with tilde | ã or ã |
+| ä or ä | latin small letter a with diaeresis | ä or ä |
+| å or å | latin small letter a with ring above = latin small letter a ring | å or å |
+| æ or æ | latin small letter ae = latin small ligature ae | æ or æ |
+| ç or ç | latin small letter c with cedilla | ç or ç |
+| è or è | latin small letter e with grave | è or è |
+| é or é | latin small letter e with acute | é or é |
+| ê or ê | latin small letter e with circumflex | ê or ê |
+| ë or ë | latin small letter e with diaeresis | ë or ë |
+| ì or ì | latin small letter i with grave | ì or ì |
+| í or í | latin small letter i with acute | í or í |
+| î or î | latin small letter i with circumflex | î or î |
+| ï or ï | latin small letter i with diaeresis | ï or ï |
+| ð or ð | latin small letter eth | ð or ð |
+| ñ or ñ | latin small letter n with tilde | ñ or ñ |
+| ò or ò | latin small letter o with grave | ò or ò |
+| ó or ó | latin small letter o with acute | ó or ó |
+| ô or ô | latin small letter o with circumflex | ô or ô |
+| õ or õ | latin small letter o with tilde | õ or õ |
+| ö or ö | latin small letter o with diaeresis | ö or ö |
+| ÷ or ÷ | division sign | ÷ or ÷ |
+| ø or ø | latin small letter o with stroke, = latin small letter o slash | ø or ø |
+| ù or ù | latin small letter u with grave | ù or ù |
+| ú or ú | latin small letter u with acute | ú or ú |
+| û or û | latin small letter u with circumflex | û or û |
+| ü or ü | latin small letter u with diaeresis | ü or ü |
+| ý or ý | latin small letter y with acute | ý or ý |
+| þ or þ | latin small letter thorn | þ or þ |
+| ÿ or ÿ | Small y, dieresis or umlaut mark | ÿ or ÿ |
+| Πor Π| latin capital ligature OE | Πor Π|
+| œ or œ | latin small ligature oe | œ or œ |
+| Š or Š | latin capital letter S with caron | Š or Š |
+| š or š | latin small letter s with caron | š or š |
+| Ÿ or Ÿ | latin capital letter Y with diaeresis | Ÿ or Ÿ |
+| ƒ or ƒ | latin small f with hook = function = florin | ƒ or ƒ |
+| ˆ or ˆ | modifier letter circumflex accent | ˆ or ˆ |
+| ˜ or ˜ | small tilde | ˜ or ˜ |
+| Α or Α | greek capital letter alpha | Α or Α |
+| Β or Β | greek capital letter beta | Β or Β |
+| Γ or Γ | greek capital letter gamma | Γ or Γ |
+| Δ or Δ | greek capital letter delta | Δ or Δ |
+| Ε or Ε | greek capital letter epsilon | Ε or Ε |
+| Ζ or Ζ | greek capital letter zeta | Ζ or Ζ |
+| Η or Η | greek capital letter eta | Η or Η |
+| Θ or Θ | greek capital letter theta | Θ or Θ |
+| Ι or Ι | greek capital letter iota | Ι or Ι |
+| Κ or Κ | greek capital letter kappa | Κ or Κ |
+| Λ or Λ | greek capital letter lambda | Λ or Λ |
+| Μ or Μ | greek capital letter mu | Μ or Μ |
+| Ν or Ν | greek capital letter nu | Ν or Ν |
+| Ξ or Ξ | greek capital letter xi | Ξ |
+| Ο or Ο | greek capital letter omicron | Ο or Ο |
+| Π or Π | greek capital letter pi | Π or Π |
+| Ρ or Ρ | greek capital letter rho | Ρ or Ρ |
+| Σ or Σ | greek capital letter sigma | Σ or Σ |
+| Τ or Τ | greek capital letter tau | Τ or Τ |
+| Υ or Υ | greek capital letter upsilon | Υ or Υ |
+| Φ or Φ | greek capital letter phi | Φ or Φ |
+| Χ or Χ | greek capital letter chi | Χ or Χ |
+| Ψ or Ψ | greek capital letter psi | Ψ or Ψ |
+| Ω or Ω | greek capital letter omega | Ω or Ω |
+| α or α | greek small letter alpha | α or α |
+| β or β | greek small letter beta | β or β |
+| γ or γ | greek small letter gamma | γ or γ |
+| δ or δ | greek small letter delta | δ or δ |
+| ε or ε | greek small letter epsilon | ε or ε |
+| ζ or ζ | greek small letter zeta | ζ or ζ |
+| η or η | greek small letter eta | η or η |
+| θ or θ | greek small letter theta | θ or θ |
+| ι or ι | greek small letter iota | ι or ι |
+| κ or κ | greek small letter kappa | κ or κ |
+| λ or λ | greek small letter lambda | λ or λ |
+| μ or μ | greek small letter mu | μ or μ |
+| ν or ν | greek small letter nu | ν or ν |
+| ξ or ξ | greek small letter xi | ξ |
+| ο or ο | greek small letter omicron | ο or ο |
+| π or π | greek small letter pi | π or π |
+| ρ or ρ | greek small letter rho | ρ or ρ |
+| ς or ς | greek small letter final sigma | ς or ς |
+| σ or σ | greek small letter sigma | σ or σ |
+| τ or τ | greek small letter tau | τ or τ |
+| υ or υ | greek small letter upsilon | υ or υ |
+| φ or φ | greek small letter phi | φ or φ |
+| χ or χ | greek small letter chi | χ or χ |
+| ψ or ψ | greek small letter psi | ψ or ψ |
+| ω or ω | greek small letter omega | ω or ω |
+| ϑ or ϑ | greek small letter theta symbol | ϑ or ϑ |
+| ϒ or ϒ | greek upsilon with hook symbol | ϒ or ϒ |
+| ϖ or ϖ | greek pi symbol | ϖ or ϖ |
+|   or   | en space | or |
+|   or   | em space | or |
+|   or   | thin space | or |
+| ‌ or ‌ | zero width non-joiner | or |
+| ‍ or ‍ | zero width joiner | or |
+| ‎ or ‎ | left-to-right mark | or |
+| ‏ or ‏ | right-to-left mark | or |
+| – or – | en dash | – or – |
+| — or — | em dash | — or — |
+| ‘ or ‘ | left single quotation mark | ‘ or ‘ |
+| ’ or ’ | right single quotation mark | ’ or ’ |
+| ‚ or ‚ | single low-9 quotation mark | ‚ or ‚ |
+| “ or “ | left double quotation mark | “ or “ |
+| ” or ” | right double quotation mark | ” or ” |
+| „ or „ | double low-9 quotation mark | „ or „ |
+| † or † | dagger | † or † |
+| ‡ or ‡ | double dagger | ‡ or ‡ |
+| • or • | bullet = black small circle | • or • |
+| … or … | horizontal ellipsis = three dot leader | … or … |
+| ‰ or ‰ | per mille sign | ‰ or ‰ |
+| ′ or ′ | prime = minutes = feet | ′ or ′ |
+| ″ or ″ | double prime = seconds = inches | ″ or ″ |
+| ‹ or ‹ | single left-pointing angle quotation mark | ‹ or ‹ |
+| › or › | single right-pointing angle quotation mark | › or › |
+| ‾ or ‾ | overline = spacing overscore | ‾ or ‾ |
+| ⁄ or ⁄ | fraction slash | ⁄ or ⁄ |
+| € or € | euro sign | € or € |
+| ℑ or ℑ | blackletter capital I = imaginary part | ℑ or ℑ |
+| ℘ or ℘ | script capital P = power set = Weierstrass p | ℘ or ℘ |
+| ℜ or ℜ | blackletter capital R = real part symbol | ℜ or ℜ |
+| ™ or ™ | trade mark sign | ™ or ™ |
+| ℵ or ℵ | alef symbol = first transfinite cardinal | ℵ or ℵ |
+| ← or ← | leftwards arrow | ← or ← |
+| ↑ or ↑ | upwards arrow | ↑ or ↑ |
+| → or → | rightwards arrow | → or → |
+| ↓ or ↓ | downwards arrow | ↓ or ↓ |
+| ↔ or ↔ | left right arrow | ↔ or ↔ |
+| ↵ or ↵ | downwards arrow with corner leftwards = carriage return | ↵ or ↵ |
+| ⇐ or ⇐ | leftwards double arrow | ⇐ or ⇐ |
+| ⇑ or ⇑ | upwards double arrow | ⇑ or ⇑ |
+| ⇒ or ⇒ | rightwards double arrow | ⇒ or ⇒ |
+| ⇓ or ⇓ | downwards double arrow | ⇓ or ⇓ |
+| ⇔ or ⇔ | left right double arrow | ⇔ or ⇔ |
+| ∀ or ∀ | for all | ∀ or ∀ |
+| ∂ or ∂ | partial differential | ∂ or ∂ |
+| ∃ or ∃ | there exists | ∃ or ∃ |
+| ∅ or ∅ | empty set = null set = diameter | ∅ or ∅ |
+| ∇ or ∇ | nabla = backward difference | ∇ or ∇ |
+| ∈ or ∈ | element of | ∈ or ∈ |
+| ∉ or ∉ | not an element of | ∉ or ∉ |
+| ∋ or ∋ | contains as member | ∋ or ∋ |
+| ∏ or ∏ | n-ary product = product sign | ∏ or ∏ |
+| ∑ or ∑ | n-ary sumation | ∑ or ∑ |
+| − or − | minus sign | − or − |
+| ∗ or ∗ | asterisk operator | ∗ or ∗ |
+| √ or √ | square root = radical sign | √ or √ |
+| ∝ or ∝ | proportional to | ∝ or ∝ |
+| ∞ or ∞ | infinity | ∞ or ∞ |
+| ∠ or ∠ | angle | ∠ or ∠ |
+| ∧ or ∧ | logical and = wedge | ∧ or ∧ |
+| ∨ or ∨ | logical or = vee | ∨ or ∨ |
+| ∩ or ∩ | intersection = cap | ∩ or ∩ |
+| ∪ or ∪ | union = cup | ∪ or ∪ |
+| ∫ or ∫ | integral | ∫ or ∫ |
+| ∴ or ∴ | therefore | ∴ or ∴ |
+| ∼ or ∼ | tilde operator = varies with = similar to | ∼ or ∼ |
+| ≅ or ≅ | approximately equal to | ≅ or ≅ |
+| ≈ or ≈ | almost equal to = asymptotic to | ≈ or ≈ |
+| ≠ or ≠ | not equal to | ≠ or ≠ |
+| ≡ or ≡ | identical to | ≡ or ≡ |
+| ≤ or ≤ | less-than or equal to | ≤ or ≤ |
+| ≥ or ≥ | greater-than or equal to | ≥ or ≥ |
+| ⊂ or ⊂ | subset of | ⊂ or ⊂ |
+| ⊃ or ⊃ | superset of | ⊃ or ⊃ |
+| ⊄ or ⊄ | not a subset of | ⊄ or ⊄ |
+| ⊆ or ⊆ | subset of or equal to | ⊆ or ⊆ |
+| ⊇ or ⊇ | superset of or equal to | ⊇ or ⊇ |
+| ⊕ or ⊕ | circled plus = direct sum | ⊕ or ⊕ |
+| ⊗ or ⊗ | circled times = vector product | ⊗ or ⊗ |
+| ⊥ or ⊥ | up tack = orthogonal to = perpendicular | ⊥ or ⊥ |
+| ⋅ or ⋅ | dot operator | ⋅ or ⋅ |
+| ⌈ or ⌈ | left ceiling = apl upstile | ⌈ or ⌈ |
+| ⌉ or ⌉ | right ceiling | ⌉ or ⌉ |
+| ⌊ or ⌊ | left floor = apl downstile | ⌊ or ⌊ |
+| ⌋ or ⌋ | right floor | ⌋ or ⌋ |
+| 〈 or ⟨ | left-pointing angle bracket = bra | 〈 or ⟨ |
+| 〉 or ⟩ | right-pointing angle bracket = ket | 〉 or ⟩ |
+| ◊ or ◊ | lozenge | ◊ or ◊ |
+| ♠ or ♠ | black spade suit | ♠ or ♠ |
+| ♣ or ♣ | black club suit = shamrock | ♣ or ♣ |
+| ♥ or ♥ | black heart suit = valentine | ♥ or ♥ |
+| ♦ or ♦ | black diamond suit | ♦ or ♦ |
+| ✔ | Check Mark | ✔ |
+
+
CSS Level 2 Revision 1 Rec 2011-06-07