Adds a toggle feature for subscribing to the recalibration beta under SEO -> General -> Features.
When the recalibration feature is enabled:
The single title assessment is added. This assessment makes sure that you don't use superfluous H1s in your text.
Keyphrase density: changes scoring schema to account for the length of the keyphrase and changes feedback strings so that we give feedback about the number of occurrences rather than a percentage.
Outbound links assessment: changes the scoring schema so that red bullet instead of an orange bullet is shown when you have no outbound links.
Image alt attributes: if there are at least 5 images, checks whether the alt tags contain the keyphrase or synoynyms in 30-70% of all images. If there are less than 5 images, 1 image with the keyphrase or synonym in the alt tag is still scored as good.
Keyphrase in title: function words preceding the exact match keyphrase are ignored when determining the position of the keyphrase in the title.
Keyphrase length: makes the scoring scheme less strict for languages that don't have function word support, so that for these languages keyphrases with 1-6 words are scored as green, 7-9 as orange, and more than 9 as red.
Keyphrase in subheading: only takes H2 and H3 level subheadings into account and changes the scoring schema so that 30%-75% of these subheadings need to include the keyphrase or its synonyms. In languages without function word support, a match is only counted if all the words from the keyphrase/synonym appear in the subheading.
Text length: on taxonomy pages, the recommended minimum text length is increased from 150 to 250 words.
The assessment checking the length or your URL.
The assessment checking whether your URL contains stopwords.