diff --git a/lib/ace/mode/html.js b/lib/ace/mode/html.js
index 066c79e7..0eaf0c1c 100644
--- a/lib/ace/mode/html.js
+++ b/lib/ace/mode/html.js
@@ -55,6 +55,226 @@ var Mode = function() {
 };
 oop.inherits(Mode, TextMode);
 
+var commonAttributes = [
+    "accesskey",
+    "class",
+    "contenteditable",
+    "contextmenu",
+    "dir",
+    "draggable",
+    "dropzone",
+    "hidden",
+    "id",
+    "lang",
+    "spellcheck",
+    "style",
+    "tabindex",
+    "title",
+    "translate"
+];
+
+var eventAttributes = [
+    "onabort",
+    "onblur",
+    "oncancel",
+    "oncanplay",
+    "oncanplaythrough",
+    "onchange",
+    "onclick",
+    "onclose",
+    "oncontextmenu",
+    "oncuechange",
+    "ondblclick",
+    "ondrag",
+    "ondragend",
+    "ondragenter",
+    "ondragleave",
+    "ondragover",
+    "ondragstart",
+    "ondrop",
+    "ondurationchange",
+    "onemptied",
+    "onended",
+    "onerror",
+    "onfocus",
+    "oninput",
+    "oninvalid",
+    "onkeydown",
+    "onkeypress",
+    "onkeyup",
+    "onload",
+    "onloadeddata",
+    "onloadedmetadata",
+    "onloadstart",
+    "onmousedown",
+    "onmousemove",
+    "onmouseout",
+    "onmouseover",
+    "onmouseup",
+    "onmousewheel",
+    "onpause",
+    "onplay",
+    "onplaying",
+    "onprogress",
+    "onratechange",
+    "onreset",
+    "onscroll",
+    "onseeked",
+    "onseeking",
+    "onselect",
+    "onshow",
+    "onstalled",
+    "onsubmit",
+    "onsuspend",
+    "ontimeupdate",
+    "onvolumechange",
+    "onwaiting"
+];
+
+var globalAttributes = commonAttributes.concat(eventAttributes);
+
+var attributeMap = {
+    "html": ["manifest"],
+    "head": [],
+    "title": [],
+    "base": ["href", "target"],
+    "link": ["href", "hreflang", "rel", "media", "type", "sizes"],
+    "meta": ["http-equiv", "name", "content", "charset"],
+    "style": ["type", "media", "scoped"],
+    "script": ["charset", "type", "src", "defer", "async"],
+    "noscript": ["href"],
+    "body": ["onafterprint", "onbeforeprint", "onbeforeunload", "onhashchange", "onmessage", "onoffline", "onpopstate", "onredo", "onresize", "onstorage", "onundo", "onunload"],
+    "section": [],
+    "nav": [],
+    "article": ["pubdate"],
+    "aside": [],
+    "h1": [],
+    "h2": [],
+    "h3": [],
+    "h4": [],
+    "h5": [],
+    "h6": [],
+    "header": [],
+    "footer": [],
+    "address": [],
+    "main": [],
+    "p": [],
+    "hr": [],
+    "pre": [],
+    "blockquote": ["cite"],
+    "ol": ["start", "reversed"],
+    "ul": [],
+    "li": ["value"],
+    "dl": [],
+    "dt": [],
+    "dd": [],
+    "figure": [],
+    "figcaption": [],
+    "div": [],
+    "a": ["href", "target", "ping", "rel", "media", "hreflang", "type"],
+    "em": [],
+    "strong": [],
+    "small": [],
+    "s": [],
+    "cite": [],
+    "q": ["cite"],
+    "dfn": [],
+    "abbr": [],
+    "data": [],
+    "time": ["datetime"],
+    "code": [],
+    "var": [],
+    "samp": [],
+    "kbd": [],
+    "sub": [],
+    "sup": [],
+    "i": [],
+    "b": [],
+    "u": [],
+    "mark": [],
+    "ruby": [],
+    "rt": [],
+    "rp": [],
+    "bdi": [],
+    "bdo": [],
+    "span": [],
+    "br": [],
+    "wbr": [],
+    "ins": ["cite", "datetime"],
+    "del": ["cite", "datetime"],
+    "img": ["alt", "src", "height", "width", "usemap", "ismap"],
+    "iframe": ["name", "src", "height", "width", "sandbox", "seamless"],
+    "embed": ["src", "height", "width", "type"],
+    "object": ["param", "data", "type", "height" , "width", "usemap", "name", "form", "classid"],
+    "param": ["name", "value"],
+    "video": ["src", "autobuffer", "autoplay", "loop", "controls", "width", "height", "poster"],
+    "audio": ["src", "autobuffer", "autoplay", "loop", "controls"],
+    "source": ["src", "type", "media"],
+    "track": ["kind", "src", "srclang", "label", "default"],
+    "canvas": ["width", "height"],
+    "map": ["name"],
+    "area": ["shape", "coords", "href", "hreflang", "alt", "target", "media", "rel", "ping", "type"],
+    "svg": [],
+    "math": [],
+    "table": ["summary"],
+    "caption": [],
+    "colgroup": ["span"],
+    "col": ["span"],
+    "tbody": [],
+    "thead": [],
+    "tfoot": [],
+    "tr": [],
+    "td": ["headers", "rowspan", "colspan"],
+    "th": ["headers", "rowspan", "colspan", "scope"],
+    "form": ["accept-charset", "action", "autocomplete", "enctype", "method", "name", "novalidate", "target"],
+    "fieldset": ["disabled", "form", "name"],
+    "legend": [],
+    "label": ["form", "for"],
+    "input": ["type", "accept", "alt", "autocomplete", "checked", "disabled", "form", "formaction", "formenctype", "formmethod", "formnovalidate", "formtarget", "height", "list", "max", "maxlength", "min", "multiple", "pattern", "placeholder", "readonly", "required", "size", "src", "step", "width", "files", "value"],
+    "button": ["autofocus", "disabled", "form", "formaction", "formenctype", "formmethod", "formnovalidate", "formtarget", "name", "value", "type"],
+    "select": ["autofocus", "disabled", "form", "multiple", "name", "size"],
+    "datalist": [],
+    "optgroup": ["disabled", "label"],
+    "option": ["disabled", "selected", "label", "value"],
+    "textarea": ["autofocus", "disabled", "form", "maxlength", "name", "placeholder", "readonly", "required", "rows", "cols", "wrap"],
+    "keygen": ["autofocus", "challenge", "disabled", "form", "keytype", "name"],
+    "output": ["for", "form", "name"],
+    "progress": ["value", "max"],
+    "meter": ["value", "min", "max", "low", "high", "optimum"],
+    "details": ["open"],
+    "summary": [],
+    "command": ["type", "label", "icon", "disabled", "checked", "radiogroup", "command"],
+    "menu": ["type", "label"],
+    "dialog": ["open"]
+};
+
+var allElements = Object.keys(attributeMap);
+
+
+var TokenIterator = require("../token_iterator").TokenIterator;
+
+function hasType(token, type) {
+    var tokenTypes = token.type.split('.');
+    return type.split('.').every(function(type){
+        return (tokenTypes.indexOf(type) !== -1);
+    });
+}
+
+function findTagName(iterator) {
+    var token = iterator.getCurrentToken();
+    if (!token || !hasType(token, 'tag') && !(hasType(token, 'text') && token.value.match('/'))){
+        do {
+            token = iterator.stepBackward();
+        } while (token && (hasType(token, 'string') || hasType(token, 'operator') || hasType(token, 'attribute-name') || hasType(token, 'text')));
+    }
+    if (!token || !hasType(token, 'tag-name') || iterator.stepBackward().value.match('/')) {
+        return
+    }
+    var element = token.value;
+
+    return element;
+}
+
 (function() {
 
     this.blockComment = {start: "<!--", end: "-->"};
@@ -67,6 +287,54 @@ oop.inherits(Mode, TextMode);
         return false;
     };
 
+    this.getCompletions = function(state, session, pos, prefix, callback) {
+        var iterator = new TokenIterator(session, pos.row, pos.column);
+        var token = iterator.getCurrentToken();
+
+        if (!token)
+            return [];
+
+        // tag name
+        if (hasType(token, "tag-name") || (token.value == '<' && hasType(token, "text"))) {
+            var elements = allElements;
+            if (prefix) {
+                elements = elements.filter(function(element){
+                    return element.indexOf(prefix) === 0;
+                });
+            }
+            return elements.map(function(element){
+                return {
+                    value: element,
+                    meta: "tag"
+                };
+            });
+        }
+
+        // tag attribute
+        if (hasType(token, 'text') || hasType(token, 'attribute-name')) {
+            var tagName = findTagName(iterator);
+            if (!tagName)
+                return [];
+            var attributes = globalAttributes;
+            if (tagName in attributeMap) {
+                attributes = attributes.concat(attributeMap[tagName]);
+            }
+            if (prefix) {
+                attributes = attributes.filter(function(attribute){
+                    return attribute.indexOf(prefix) === 0;
+                });
+            }
+            return attributes.map(function(attribute){
+                return {
+                    value: attribute,
+                    meta: "attribute"
+                };
+            });
+        }
+
+        return [];
+    }
+
 }).call(Mode.prototype);
 
 exports.Mode = Mode;