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  1. Shadow DOM (unprefixed)

    Enables DOM tree encapsulation. Without it, widgets may inadvertently break pages by using conflicting CSS selectors, class or id names, or JavaScript variables.

    http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html

    11,906 votes
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      104 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
    • Custom Elements

      Method for registering (creating) custom elements in script.

      Spec: http://www.w3.org/TR/custom-elements/

      10,508 votes
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        93 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
      • HTML Imports

        Import HTML documents into other HTML documents.

        Spec: https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/imports/index.html

        8,289 votes
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          91 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
        • Dialog element

          This feature would add support for the <dialog> element to create in-page modal windows.

          https://html.spec.whatwg.org/multipage/forms.html#the-dialog-element

          1,272 votes
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            8 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
          • 1,101 votes
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              31 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
            • Drag and Drop Directories

              Allows dragging and dropping entire folders using HTML5 Drag and Drop. Extends the DataTransferItem with a method to get a FileEntry/DirectoryEntry.

              Spec: http://wiki.whatwg.org/wiki/DragAndDropEntries

              770 votes
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                7 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
              • W3C Manifest support

                Add support for the new W3C manifest specification for pinned apps as well as for Windows store applications.

                The spec allows for vendor extensions which can be used for things missing in the Level 1 of the spec. A lot of things have already been planned for Level 2 so it would be great if the MS team could participate in the discussions

                733 votes
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                  5 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                • HTML5 menu tag & contextmenu attribute

                  This feature would add the ability for web apps to define custom context menu actions on elements.

                  426 votes
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                    6 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                  • iframe[srcdoc] attribute

                    Gives the content of an iframe as a src context to embed (e.g. <iframe seamless srcdoc="<b>Hello World</b>"></iframe>).

                    Spec: http://www.w3.org/html/wg/drafts/html/master/embedded-content.html#attr-iframe-srcdoc

                    314 votes
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                      working on it  ·  3 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                    • 195 votes
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                        0 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                      • Full spec support for "accept" in Input Type=File

                        Provide full support of the accept attribute in a input type="file"

                        https://html.spec.whatwg.org/multipage/forms.html#attr-input-accept

                        http://caniuse.com/#feat=input-file-accept

                        Allows you to restrict the UX to valid file formats when necessary. Image uploads, PDF's, etc.

                        188 votes
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                          3 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                        • Microdata

                          Microdata is used to nest semantics within existing content on web pages.

                          http://www.w3.org/TR/microdata/

                          130 votes
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                            4 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                          • [inputmode] content attribute

                            The inputmode content attribute is an enumerated attribute that specifies what kind of input mechanism would be most helpful for users entering content into the form control.

                            http://www.w3.org/html/wg/drafts/html/master/forms.html#attr-fe-inputmode

                            121 votes
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                              2 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                            • Support a[download] attribute for data URIs

                              The download attribute doesn't appear to be used when downloading a hyperlink containing an href like the following:

                              <a id="a" href="blob:E0F5CA16-F4AA-4B18-9A07-BFDD1F0633BD" type="text/plain" download="test.txt">Download</a>

                              $('#a').attr('href', URL.createObjectURL(new Blob([data])));

                              Instead, the downloaded file gets the filename "E0F5CA16-F4AA-4B18-9A07-BFDD1F0633BD".

                              120 votes
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                                2 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                              • Implement <table sortable>

                                It is a common use case with data tables that one would like to sort the data, to order by a particular column (or multiple columns.)

                                Currently this must be done via JavaScript, but HTML5.1 has the `sortable` attribute for <table> [1] and the `sorted` attribute for <th> [2]

                                [1] http://www.w3.org/html/wg/drafts/html/master/tabular-data.html#attr-table-sortable
                                [2] http://www.w3.org/html/wg/drafts/html/master/tabular-data.html#attr-th-sorted

                                120 votes
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                                  1 comment  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                                • ol[reversed] attribute

                                  Please support this simple addition to build reversed ordered lists in HTML5.

                                  65 votes
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                                    3 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Allow data: / blob: URLs in iframe src

                                    Currently IE is an only browser I know to block blob:/data: URLs as an iframe src. Since iframes do not provide any other way to set Content-Type, this disallows some interesting client-side scenarios such as iframed SVG preview.

                                    61 votes
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                                      1 comment  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Support dir="auto"

                                      dir="auto" dramatically simplifies dealing with variable and user-generated content whose language is not known.
                                      It'd also allow site generators that convert from formats like Markdown to almost automagically support mixed-direction document with almost no changes to the generator — they just has to slap dir=auto all over the place. While not perfect, it's about the best that can be done when the input doesn't contain language information.

                                      Doc: http://www.w3.org/International/articles/inline-bidi-markup/#dirauto
                                      Spec: https://html.spec.whatwg.org/multipage/dom.html#the-dir-attribute
                                      Tests: http://www.w3.org/International/tests/repository/html5/the-dir-attribute/results-dir-auto
                                      Browser support: Firefox, Chromium, Safari, Opera

                                      To be useful for flipped layout, you'd also need to support CSS logical properties e.g. `text-align: start`:
                                      https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/7438435-css-logical-properties

                                      Ideally dir="auto" should…

                                      59 votes
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                                        4 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                                      • minlength attribute

                                        We have the maxlength attribute to control the maximum number of characters in an <input> or <textarea>. The minlength attribute is new in HTML5, and is used to specify the minimum number of characters. We definitely need that, please be the first browser to implement it.

                                        Spec: http://w3.org/TR/html5/forms.html#attr-input-minlength

                                        56 votes
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                                          in preview  ·  2 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Add ability to type in into input type="date" and input type= "datetime-local"

                                          Add ability to type in into input type="date" and input type ="datetime-local" as:
                                          1. By default the range in the datepicker is restricted +/- 100 years which is not always the case
                                          2. Changing min/max attribute crashes the browser
                                          3. Overall it would be more user friendly to just type in the value in some case with huge distance between actual and expected value

                                          The case: actual value 12/31/9999 being change, expected value 12/31/2017 (the one to be changed to)

                                          48 votes
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                                            0 comments  ·  HTML  ·  Flag idea as inappropriate…  ·  Admin →
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