What does this mean?

People using screen readers are not able to see the layout of a form. To make forms accessible, they must define explicit text labels for each form control.

Usually the best solution is to use a <label> element. The label may be linked to by the form control:

<label for="name">Full name</label>
<input type="name" id="name">

or the <label> can be wrapped around the form control:

    Full name <input type="name">

Buttons are different, as their labels are specified by the code for the button, e.g.

<input type="submit" value="Send message">
<button>Send message</button>

Alternatively ARIA attributes, such as aria-label may be used, but this information will not be conveyed to visual users. For more information, see W3C's guide to labeling controls.

Hidden input fields (<input type="hidden">) do not require labels. Note that the placeholder attribute should not be used as an alternative to a label.

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HTML Found on page Issues
<input id="keyword" type="text" name="keyword" class="keyword ui-autocomplete-input" placeholder="Search courses" autocomplete="off" title="course search keyword field"> 2
<input id="auto" type="text" name="auto" title="course search auto field"> 2
<input aria-labelledby="functional-cookies" type="checkbox" class="onoffswitch-checkbox" id="cFunct" checked="checked" value="1" onclick="cookieConfigChange(this);"> 1
<input type="text" id="from" placeholder="departure town/postcode" title="departure town/postcode" class="pac-target-input" autocomplete="off"> 1
<input aria-labelledby="social-cookies" type="checkbox" class="onoffswitch-checkbox" id="cThird" checked="checked" value="3" onclick="cookieConfigChange(this);"> 1
<input aria-labelledby="targeting-cookies" type="checkbox" class="onoffswitch-checkbox" id="cTarget" checked="checked" value="4" onclick="cookieConfigChange(this);"> 1
<input accesskey="q" class="form-control query tt-input" data-ng-disabled="isDisplayed('cart') || isDisplayed('history')" id="query" name="query" required title="Search query" type="text" autocomplete="off" spellcheck="false" dir="auto" style="position: relative; vertical-align: top; background-color: transparent;"> 1
<select id="selectedCampus" autofocus title="Selected campus">...</select> 1
<input aria-labelledby="performance-cookies" type="checkbox" class="onoffswitch-checkbox" id="cPerf" checked="checked" value="2" onclick="cookieConfigChange(this);"> 1
<input type="text" id="keyword" name="keyword" class="keyword coursesAutocomplete ui-autocomplete-input" placeholder="Start typing for course suggestions" autocomplete="off" title="Course Search Query"> 1
15 distinct issues were found in the sample of 125 web pages. Only the first 10 issues are shown here.
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